...you can’t usually solve the problem of their crimes with more laws.

From Jack Dunphy at NRO:

“The rush to blame the school’s administration and police is a reflection of a society that believes any and all misfortune can be averted by the proper application of government will. At this very moment, politicians in Richmond, Va., and Washington, D.C., are exerting their tiny brains trying to be the first to propose legislation that will “prevent the next tragedy.” The number of laws the killer broke on Monday will probably run to more than 20, but there are those who actually believe he might have been deterred by a few more strokes of a legislative pen. I can’t put it any more simply than this: There are evil people in the world, and no amount of laws will make them any less so.”

Quite right.  But there are plenty of good people in the world too, and the best way to protect them from the evil people is to give them a free rein to protect themselves.  Not to mention their property and their families.