I know.
My point is that when you punish someone you place yourself above them in order to show them that their actions were wrong.
However when you condone such acts (of violence that have
nothing to do with the intended
educative punishment) you thereby
nullify your position rendering the act of punishment irrelevant.
Further more, you justify their (criminal) actions (for which they were supposed to be punished) and legitimise them since you reverted to the same behaviour.