It's one of those circular problems. Guns are easy to get, they eventually get into the hands of the wrong people through theft or owner stupidity, more guns are used in crimes, gun restrictions tighten up. The problem then leads to the average joe having a tougher time getting a hold of a gun and the criminals still able to access guns through ill-gotten means. There needs to be obvious checks against violent felons and certain people with mental issues but it's too late for sweeping banning. The seeds have grown up.