the question is, are we dealing a totally sane person who is fully capable of rational thought and fully capable of his/her own decisions, or are we dealing with who is insane and not in full control of his mental faculties? If the person is sane, I say let him/her make their own decisions. If the person is not sane or not rational, then I think would be wrong to stand by and do nothing while he/she kills him/herself. Also anyone under the age of 18 should not be able to kill themselves. If they cannot vote, sue, drink legally, consent to sex, they should not have the right to decide to kill themselves.