“And then when your enemy is acting outside the limits the law, you have no basis to call them on it. Your guy did it too.”
Actually, the only way to get demondogs to obey the law is to break the law with impunity as they do.
Simply remind them, “You did this! So, shut up and eat it.”
At every turn rub their face in their own perfidy. Throw Saul Alinsky back at them until they repent and at least some of them go to prison.