I would kill for meat. (or maybe I would rather starve)
Or to protect my youngster's, people close to me, or myself.
Not for much else though...
revenge or justice.
money or power.
I could e-kill for excessive fluff posts.
Me? I couldn't kill. I hate to spray roaches.
My religion or spiritual beliefs would restrain me.
If I were out of control or in a rage.