Except it isn't, at all. Short term, sure, and obviously if death is permanent then that's a different matter, but you don't change anyone's mind with violence. All you do is scare them into complying for awhile, if even that.

[The emotional and mental damage can be long lasting, but violence itself--or the threat of it--is an unreliable, short-term 'solution' at the very best. He's never really understood why anyone would use it unless they enjoy it, but maybe that's just it.]