Do the math... if there are many who hate enough to do these things, and there are millions of guns available... with lax laws about them, there WILL be crimes such as this.

And when generations of people have their egos invested in having guns.. whether they need them or not, the laws will be not be changed easily, and the number of guns will only increase because the firearms industry needs to sell MORE to stay in business. It is a vicious circle with (mostly) innocent people suffering from the viciousness of it.