system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:  Why is suicide illegal?

Obviously, you can't be put in jail for committing it.  Attempted suicide is still widely illegal.  Why are people not allowed to do what they want with their bodies?
gpt
1) By making it illegal, the police have the authority to stop someone who is about to commit suicide. 

2) Generally when someone is suicidal, it's the result of a recognized mental illness, such as depression.  Legally, some decisions, such as a "do not resuscitate" or medical refusal order must be made by someone who's mentally sound.