Pass universal background checks and improve the federal NICS system to more accurately report known criminals, mentally ill, and domestic abusers. It won't be perfect - but it will greatly help. Traffic and vehicles laws and enforcement don't stop all violators - but they greatly help to make our driving experience much safer.
so what? dude, you're talking nonsense. you have no way to get medical backgrounds, ever hear of patient rights? crazy people will always win, because no one can predict the future. And until that day comes, we're all stuck with reading news papers and getting tv news.