Being from oppressive Canada where people are drones, lemmings and we are surrounded by state patsies, you need to understand that being free carries some risks. It's the way it is. In a nation of 350M you are going to have on a daily even hourly basis, crime, some horrific/heart breaking and enraging. That's the cost of freedom. Sorry to say it, but you can't have oppressive tactics which deny people rights every time there is a bit of a concern. You can't have state cameras in your homes and GPS inserted in your bodies. Everyone want to prescribe that one factor that will magically stop all criminals and nutjobs. It can't happen. Whether it's via use of a gun or vehicle, it will continue, all you can do is try and prevent. The earlier the intervention in peoples lives the better.