is most (if not all) religions says killing youself in going against god's will. The heavens grant the life to a person, the most precious gift of them all that is not returnable, and if you decides to throw it away because of some petty matters (anything aside from sacrificing your life to save another's life is considered petty) it shows you are being rude and going against the heavens. also, life is meant as a tool for human to help other people. if a person is dead, they can't help other people. even if you are disable, ugly or whatever, you can still motivates peoples to do better and appreciate life even more. therefore, by religion people are not allowed to kill themselves. (sacrificing is a different term)
Your question is not well phrased. The law allows someone to kill to defend themselves, they nevertheless still have to prove such a circumstance. Should a person be allowed to kill in self-defense? That is a personal choice.
Doctors are NOT allowed to kill people.
No but they can be depressed for being single and the depression can make them kill themselves.
people can kill or injure themselves can kill others
To gain power for themselves.
NO
Flies themselves don't kill people, but some flies may carry diseases that do.
It allowed the Apaches to shoot game and to kill enemies to protect themselves
Young people kill themselves because those young people don't want to feel bad and just want to die for they wont suffer anymore
china
they probally kill themselves!
Your defense should be measures and proportionate.