What will happen if many people commit one crime? For example, if 100 or 1000 participants plan and murder someone in such a manner that they are equally guilty for example, they mutually came with the idea and willingly participated and so on, you get the idea. Will all be convicted of murder?
If the act and the evidence is sufficient, they will all be convicted. It would not be necessary, for example, to prove that it was Brutus's stab that killed the victim. It is not guaranteed that all of the participants committed the act knowed as 1st degree homicide (picking Washington law), some may be guilty of conspiracy to murder. Liability for a crime can extend to others besides the person who "did it": (3) A person is an accomplice of another person in the commission of a crime if: (a) With knowledge that it will promote or facilitate the commission of the crime, he or she: (i) Solicits, commands, encourages, or requests such other person to commit it; or (ii) Aids or agrees to aid such other person in planning or committing it
Why should they? If a person is accused of a crime, say murder, why should more evidence be needed to convict them if they are a high ranking government official than if they are just an ordinary person? Why should their trial be conducted differently? If convicted, why should their punishment be different? Yes, you can run societies that way and people have and do but it isn’t very fair is it? Equality before the law does not imply any other sort of equality People high up in the government have more power and authority than others but if they are alleged to have broken the law they are treated the same as anybody else.
Yes to everything. Justified use of force is assault / battery / homicide (as appropriate). "Assault" means that a person has placed someone in fear of their life or person. "Battery" means that a person has physically struck someone in some way. "Homicide" means that a person has killed another human. None of these definitions speak to the legality of the action. You are right about the example being assault. Justified use of force is de facto legal. Assault, battery, and homicide are normally crimes, but the justifications for using force carve out exceptions. If the circumstances fit within the justification, the person using the justified force has not committed a crime. (Generally speaking, the person targeted by said force has.) If the situation you describe fits within the laws of justification within the state (and to be fair, it probably does), then your co-worker is right about the actions being perfectly legal. Police are picky about what they investigate, and prosecutors are picky about what they charge. If it's 100% clear from the evidence that you were justified in your use of force, prosecutors will (typically) not press charges, and so police will not bother with an arrest or further investigation. It's really not worth the time and effort for a case that has 0% chance of producing a conviction. However, if the police and prosecutors have some doubts (e.g., they think your force was excessive and therefor not justified), they can still press charges. Being charged with a crime does not mean you have committed a crime. And vice-versa. Justification is an affirmative defense against charges of assault / battery / homicide. An affirmative defense does not mean "I confess to the crime but have a really good excuse." It means that you admit to certain facts that would normally be beneficial to the prosecution, but claim additional facts that either mitigate or make you innocent of the given charges. In the case of justified force, you are admitting to the action of assault, but claiming innocence. When making your defense, your theory of defense must be internally consistent. You cannot admit to a fact when convenient and deny it when it is inconvenient. "I was in Santa Fe at the time, and anyway, Sam did it," is an example of a self-consistent theory that gives multiple reasons to acquit. That's good, because the jury only needs one reason that gives them pause, and now you've got two chances at that. "I was in Santa Fe at the time, and anyway, he was threatening my life," is not internally consistent. If you argue justification, you explicitly declaim any alibi. This situation is more dangerous, because your defense rests entirely on the credibility of the justification. But if you argue an alibi, you implicitly declaim any justification. So building your defense on things the prosecution can disprove is much worse than taking an affirmative defense of justification.
In England and Wales, under section 2 of the Suicide Act 1961 (as amended by section 59 and Schedule 12 of the Coroners and Justice Act 2009) it's a criminal offence to do an act capable of encouraging or assisting someone to commit suicide. I think that applies to Scotland too, and there is similar law in Northern Ireland. Encouraging suicide is also a criminal offence in some other common law jurisdictions, e.g. in Australia. While in other common law jurisdictions, if there isn't such a law, the person might instead be prosecuted for manslaughter - or not at all. The minimum, maximum and recommended penalties may well differ between jurisdictions. I don't know what you mean by "vengeance rampage" but I'm not aware of any jurisdictions where it is lawful for a person to cause harm to someone for revenge. States tend to reserve for themselves a monopoly on the use of force.
We're missing a lot of facts that would help drive the analysis. The first question I'd ask was whether this was part of an actual or attempted sex offense. If that's the case, the suspect could be facing particularly serious charges. Other information is also missing, such as the drug involved, whether it's on the list of controlled substances, her knowledge of the drug, her relationship to the suspect, and so on. Still, based on the information we've got and the inferences we can make from them, I could reasonably see the following charges being filed: Sec. 12-3. Battery. (a) A person commits battery if he or she knowingly without legal justification by any means (1) causes bodily harm to an individual Sec. 12-3.05. Aggravated battery. (g) Offense based on certain conduct. A person commits aggravated battery when, other than by discharge of a firearm, he or she does any of the following: (1) Violates Section 401 of the Illinois Controlled Substances Act by unlawfully delivering a controlled substance to another and any user experiences great bodily harm or permanent disability as a result of the injection, inhalation, or ingestion of any amount of the controlled substance. (2) Knowingly administers to an individual or causes him or her to take, without his or her consent or by threat or deception, and for other than medical purposes, any intoxicating, poisonous, stupefying, narcotic, anesthetic, or controlled substance, or gives to another person any food containing any substance or object intended to cause physical injury if eaten. Sec. 12-4.5. Tampering with food, drugs or cosmetics. (a) A person who knowingly puts any substance capable of causing death or great bodily harm to a human being into any food, drug or cosmetic offered for sale or consumption commits tampering with food, drugs or cosmetics. Sec. 12-5. Reckless conduct. (a) A person commits reckless conduct when he or she, by any means lawful or unlawful, recklessly performs an act or acts that: (1) cause bodily harm to or endanger the safety of another person; or (2) cause great bodily harm or permanent disability or disfigurement to another person. Sec. 21-1. Criminal damage to property. (a) A person commits criminal damage to property when he or she: (1) knowingly damages any property of another Sec. 11-1.20. Criminal sexual assault. (a) A person commits criminal sexual assault if that person commits an act of sexual penetration and: (2) knows that the victim is unable to understand the nature of the act or is unable to give knowing consent; Sec. 11-1.30. Aggravated Criminal Sexual Assault. (a) A person commits aggravated criminal sexual assault if that person commits criminal sexual assault and any of the following aggravating circumstances exist during the commission of the offense or, for purposes of paragraph (7), occur as part of the same course of conduct as the commission of the offense: (2) the person causes bodily harm to the victim, except as provided in paragraph (10); (3) the person acts in a manner that threatens or endangers the life of the victim or any other person; (4) the person commits the criminal sexual assault during the course of committing or attempting to commit any other felony; (7) the person delivers (by injection, inhalation, ingestion, transfer of possession, or any other means) any controlled substance to the victim without the victim's consent or by threat or deception for other than medical purposes; Sec. 11-1.50. Criminal sexual abuse. (a) A person commits criminal sexual abuse if that person: (2) commits an act of sexual conduct and knows that the victim is unable to understand the nature of the act or is unable to give knowing consent. Sec. 11-1.60. Aggravated criminal sexual abuse. (a) A person commits aggravated criminal sexual abuse if that person commits criminal sexual abuse and any of the following aggravating circumstances exist (i) during the commission of the offense or (ii) for purposes of paragraph (7), as part of the same course of conduct as the commission of the offense: (2) the person causes bodily harm to the victim; (5) the person acts in a manner that threatens or endangers the life of the victim or any other person; (6) the person commits the criminal sexual abuse during the course of committing or attempting to commit any other felony; or (7) the person delivers (by injection, inhalation, ingestion, transfer of possession, or any other means) any controlled substance to the victim for other than medical purposes without the victim's consent or by threat or deception. Sec. 9-1. First degree Murder (a) A person who kills an individual without lawful justification commits first degree murder if, in performing the acts which cause the death: (2) he knows that such acts create a strong probability of death or great bodily harm to that individual or another; or (3) he is attempting or committing a forcible felony other than second degree murder. Sec. 9-3. Involuntary Manslaughter and Reckless Homicide. (a) A person who unintentionally kills an individual without lawful justification commits involuntary manslaughter if his acts whether lawful or unlawful which cause the death are such as are likely to cause death or great bodily harm to some individual, and he performs them recklessly Sec. 9-3.3. Drug-induced homicide. (a) A person commits drug-induced homicide when he or she violates Section 401 of the Illinois Controlled Substances Act or Section 55 of the Methamphetamine Control and Community Protection Act by unlawfully delivering a controlled substance to another, and any person's death is caused by the injection, inhalation, absorption, or ingestion of any amount of that controlled substance. Sec. 9-3.4. Concealment of homicidal death. (a) A person commits the offense of concealment of homicidal death when he or she knowingly conceals the death of any other person with knowledge that such other person has died by homicidal means. Sec. 9-3.5. Concealment of death. (b) A person commits the offense of concealment of death when he or she knowingly conceals the death of any other person who died by other than homicidal means.
Law is more like sport than mathematics You don’t know how it will turn out until you play the game. If a case goes to trial it’s because at both sides believe they can win. Both sides probably have good reasons for their belief. At least one of them is wrong.
How deterministic is the legal system? It depends. And less than we might wish. It depends on the case. How complex is the fact pattern? How strong is the evidence? How clear is the law? How compelling are the legal precedents? Questions of that nature. The only generalization I might make would be that "lower level" cases seem more deterministic than "higher level" cases. By higher level, I mean those heard by a supreme court making constitutional decisions. Here is a web site that has created a prediction market out of supreme court cases. Many have written on this topic. Read this answer. It is an excellent treatise on the subjectivity of the legal system. Written by a real attorney. Read this answer too. My advice: If you seek a deterministic system, don't look to the legal one.
As of present moment, under no circumstances. That said, the law may and probably will change around that. But the time has not come just yet. Trying to predict what the law will be is out of scope of this site.