"shoot to kill" is what you DO. "Shoot to stop" is what you SAY. LOL You can MEAN "kill" while you're saying "stop"... just don't give the scum ball's family's lawyer ammunition to hurt you. And remember, the dead guy can't refute the fact that he might not have said, "I'm going to kill you!"
The NOT-SO-FUNNY thing about this is that if there is any doubt whatsoever that the person you shot posed an imminent and credible threat to your life, and that scumbag prostitute sees where you posted on the internet to "shoot to kill" (and he/she WILL research you thoroughly and find it), you are going to have a very difficult time defending your actions. Too many people seem to think that the right to bear arms means the right to blast away at anybody who pisses you off. No sense spoon-feeding the scumbag prostitutes ammunition.
They charge extra for spooning. Look for GFE in the ads.... er....nevermind.