What would it take?
I doubt I could ever set out to kill a person...
That being said if someone hurt my child or my girl...I would enact a revenge on them so furious that the injuries could result in them dying...
give us a clue as to what you would do.....
torture people, how do you do this, do you get that chemical (not sure what), put it in a towel and cover their mouths? to have them awake in a chair tied up with an applie in their mouths?