Commiting suicide isn't always a harm to a person, euthanaisia, which is also illegal in some countries benefits the individual. An example, very technically it isn't illegal in Canada, but the fact that the legal implications are a hindrance to the victim and the criminal (obviously the same person) shows that the law is encouraging pain and suffering.. not protection from oneself. Looking at the larger picture.. a freedom, or fine is taken away from a criminal not for the protection of themselves, its done so they don't do it again. Its supposed to be there to deter the criminal from doing it again..because its a nusance to the victim or future victims. A murderer is going to be locked away to protect innocent people, not because the legal system takes a personal interrest in the murderers wellbeing.