this is assuming there is footage that it was self defense, someone could kill another person and say its self defense. no, it shouldn't be a crime, but it would be hard to prove that its self defense. if a teen whos mom has an abusive boyfriend kills the boyfriend, he should be in prison for a much shorter time than a man who killed their neighbor. should still be in prison, because lets put it this way, he did kill someone. if someone killed in self defense, they shouldnt get in jail, but it would be hard to prove that it was actually self defence.