Since the authorities seem indisposed to preventing this behavior, it will in all likelihood be done by citizen action. Perhaps in the extreme, by armed citizens.
When (not If) that occurs, that will give the Government the excuse to crack down hard. IMNVHO, That is the reason behind the conversion of Homeland Security into an increasingly para-military force.
This wave of Black-on-white crime is unlikely to contuine unofficially unpunished. That will be a national tragedy.