Remove all rehab and privileges put capital punishment back in the Penal System. Make Prison a place to be feared. Make parole boards and defense attorneys serve the time for 3 time losers. Reinstate the Draft for all as a requirement for Voting rights. Require all non felon adults to attend firearms training and be required to be armed when in the public sector.
BTW; A crazed Machete wielder would have created as much carnage.