The thugs should be charged as adults, locked up for a decade or perhaps far more for assault and battery, and permanently removed from their environment. If we just lock enough of these thugs up, the decent kids will have a chance.
If you lock them all up, the taxpayers will be on the hook for their room and board and public defender shysters. If you just tolerate them for another year or two, they will be out on the streets and a percentage will likely be terminated by gunfire by their peers. Letting nature take its course might be better when the cost/benefit analysis is complete.