Maybe it's been said, and maybe it hasn't. What sucks about killing someone in self defence is that you have killed someone. Now, the good part about it is that you are alive, but you have the rest of your life to deal with having brought someone to their end. Now it may well be you can satisfy yourself with "he needed killing", and that's fine, but I think most people who don't kill for a living will find it a bit more difficult than that.
The only extent to which I want to jump into the choice of weapon discussion is to say that it is remarkably easy to do lethal damage with bare hands, and If I have to kill someone, I'd prefer to do it that way. My hands don't go through walls unless I put them there. Course, you have to be within closing distance, but unless a firearm is already drawn, that's about 18'.
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Light a man a fire, and he will be warm while it burns.
Set a man on fire, and he will be warm for the rest of his life.
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