Are there any jurisdictions in the world where dueling is still legal? Is there any place in the world where it is still legally possible to kill someone in a duel and not be charged? If not, when and where was the last place to outlaw the practice?
According to Wikipedia, duelling was legal in Uruguay from 1921 to 1971. It cites this article and I have found in the source that the law was passed in 1920, although I haven't found that it ended in 1971. However, several politically motivated duels were fought in Uruguay in 1971, and one newspaper claimed at least one of them to be legal.
Yes, this is legal in many US states, perhaps most. Search for "adult adoption". For instance, here is the procedure in Colorado. Also, another article on the topic. Before the advent of same-sex marriage, this used to be a technique for a same-sex couple to legally formalize their relationship; one partner would adopt the other. Here is a New York Times Magazine article about the practice. Here is another article, from The Atlantic. They even refer to a case in which the parent was younger than the child.
Is this realistic? Yes. The dramatic performance plays out in the same way that it would in the U.S. Court system. The actual killing of the wife would be 'legal', so can he be charged for murder for something that has been done legally, only because they can prove is intent to kill her before that? Especially since he has already been acquitted of that fact. Mostly, this is an issue of causation and not double jeopardy. From a double jeopardy perspective, the crime of murder is not complete until the person dies, and they have not be tried for murder, so this is a different crime that had not occurred until after the attempted murder trial was over. Causation Issues Even if the immediate cause of the wife's death is withdrawal of life support, the shooting could still be a legally sufficient cause of the wife's death. For example, suppose that you shoot someone and the hospital can't give the victim a blood transfusion because the victim has blood type O- (universal donor) which can only receive blood from other people with blood type O-, and the hospital, due to negligence on the part of a hospital administrator, has run out out of type O- blood. The fact that the victim would not have died if the hospital has not negligently failed to have type O- blood on hand does not provide a defense to murder on the part of the person who shot her. While terminating life support is "legal" it also constitutes a non-judicial finding with legal effect on the part of the person authorizing it and the physicians signing off on the decision, the further medical care would have been futile and that the person whose life support was terminated was already dead in key material respects, even though they would not be dead for purposes of a murder charge until life support is terminated. When death is a natural and foreseeable result of action that causes physical harm, the death is caused by the act that causes the physical harm. Something else that causes death would have to be a "superseding cause" and not just an additional cause of death. Thus, the fact that life support was terminated legally does not mean that she cannot be a murder victim. Indeed, many murder victims are people who are on life support for some period of time and then have that life support terminated because it is futile to continue medical care and the person is already "brain dead" or something equivalent to that. Collateral Estoppel Issues Double jeopardy does carry with it a related concept of "collateral estoppel" which provides that facts necessarily decided in one criminal case cannot be decided differently in a subsequent, related criminal case in some circumstances. But, collateral estoppel applies only when the facts in the prior criminal case were necessarily decided on the merits in the prior criminal case. Acquittal of criminal charged does not necessarily include a determination that someone was innocent of the charges. The fact that he was acquitted of attempted murder does not mean that the jury found that he didn't attempt or intend to murder her. In particular, a dismissal of criminal charges as a result of a technicality that excluded evidence related to an element of the crime for which there was an acquittal, is not a determination on the merits that a particular element of a crime was actually absent, so it would not be binding in the subsequent criminal case for murder. An acquittal does not mean that every element of the prior criminal charges was found not to be present. Collateral estoppel arising from the double jeopardy right, in contrast, might be a ground for dismissal of the murder case, if the man's primary (and perhaps only) defense to the attempted murder case had been that he had established the affirmative defense that someone else committed the murder, or that he had an alibi that made it impossible for him to have committed the murder. Then, the jury would have found on the merits that this defense, equally applicable to the murder case, had already been established.
If we go by Indian case law (as we should), you have to find a way. The relevant case is K.P. Adbul Gafoor v. New India Assurance Ltd, where appellant drove on a motor cycle on a learner's permit without a licensed driver positioned correctly, in violation of Rule 3 of the Rules, and smacked someone. The bulk of the case is about the insurance and liability consequences of violating the rule: the main point here is that the court deemed this to violate the rules.
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.
If I were a federal prosecutor (which I'm emphatically not), I might try to charge you under 18 USC § 32 (a) (5): a) Whoever willfully— [...] (5) interferes with or disables, with intent to endanger the safety of any person or with a reckless disregard for the safety of human life, anyone engaged in the authorized operation of such aircraft or any air navigation facility aiding in the navigation of any such aircraft; [...] shall be fined under this title or imprisoned not more than twenty years or both. Since you clearly know, or believe, that this has the potential to interfere with piloting, which would obviously be a serious danger to people on board the aircraft, I'd argue you would be acting with "reckless disregard for the safety of human life." If your conduct results in anybody's death, then life imprisonment and/or the death penalty are also on the table, under 18 USC § 34.
Not all illegal things are crimes. Lack of evidence. They are asked to testify, and they say "what I said in my book was a lie". There is no general law against lying, except when under oath. Statute of limitations. Saying "10 years ago I did smoke drugs" means that any offence is no longer prosecutable. Lack of details. Which jurisdiction were they in? When did they commit the act, how many acts? You cannot be arrested for being a "bank robber" or a "murderer". You are charged with "robbing Bank X on 123 Fake Street the Thursday 25 April 2018" or "murdering Jim Thio in January 2017". Otherwise the defendant would have a hard time defending himself (how to prove that you have not killed anyone at any time?) All of the above combined with prosecutorial discretion in the form that any possible prosecutor will most likely determine that bringing charges would be just a waste of time and resources. UPDATE February 2018: Just for the sake of completeness, a reference to the situation of Jacques Cassandri, who did boast about a serious crime(a robbery in a Societe Generale vault in 1976) in a book. Unfortunately for him, he made some kind of mistake/miscalculation and the crime had not yet expired, so he has become an example of someone being prosecuted by confessing a crime in a book.
I do not know the particular legal environment in France, but in general the shop is private property and the owner decides who may enter and who may not. You have no right as such to enter somebody else's property against their will. Doing so would at least be classified as trespassing, possibly more serious considering you mention using force to enter the premise.