I'd only kill if I were asked to. If a love one was suffering with an illness, was in constant pain, or didn't want to be on life support, and asked me to end their life for them, and I knew they were being serious about it, I'd probably do it.

I don't believe in an eye for an eye. That’s just stupidity. The whole "you killed someone I love so I'll kill you" thing is making you no better then the person who killed your love one. I'd rather see the person rot in prison then be killed. We seriously need better prison arrangements and better sentencing for that sort of thing to happen though.