I was tempted to write a gun control-themed post, but instead I'll just quote Ed Brayton:
Let me tell you who is to blame for this: the guy pulling the trigger. That's it. End of discussion. One crazed psychotic who decides it's time to go postal is going to find a clock tower to shoot from and people to shoot at, and it doesn't matter how many laws we pass against it. Anyone who thinks otherwise needs to visit the clue store.