I want nothing of Roman law, which lacks the principle of innocent until proven guilty. The civil law of free people stems from the British Isles, which recognize that people have rights and are not the property of the government.
A secular view of the law would evaluate the blame of each party -- US law does not, as it is based on a very right-wing religious black-or-white approach to things. In this case, blame lies everywhere, starting with parents and a society who taught these kids that such behavior is manly. And a secular view of the law would reject sending kids to "criminal school", which is what jail serves as: a place where they can learn to think in terms of what they can get away with rather than in terms of responsibility, and lessons in how to commit a whole variety of crimes and get away with them. Our jail system is a very effective mechanism for increasing the rate of petty crime, because it's a training ground in regarding breaking the law as a game and in how to get away with it. A secular law system would aim at reducing crime -- this attitude of vengeance you revel in does not.
BTW, [Text: Removed] your casual dismissal of everything Quaker throws out all concepts of human dignity and worth, leaving an approach to law that regards human beings as objects, nothing more.