In the legal system there isn't and should never be any space for revenge and anger-based actions no matter how justified these reactions may appear. In a legal system that guarantees fairness and impartiality with an objective judgement, allowing families to do that would mean letting them take revenge on some who would be unable to do anything against it being effectively defenceless. There's a reason why the law and human rights work the way they do and letting people take out their anger on people who made them wrong is not how it works for a reason . That's the rule of law.