How are you so insane? Regulating guns better won't change anything, these school shootings (and various other acts of violence) don't generally come from people who go through the appropriate channels to acquire firearms. The guns used in these situations are either stolen or bought illegally. Beyond that, people who are determined to kill others don't need guns to do it, it's just convenient. You want to hurt a lot of people? Google on how to build a home-made bomb.
http://en.wikipedia.org/wiki/Bath_School_disaster
The deadliest mass murder in a school in US history; committed in 1927 by Andrew Kehoe, which killed 38 elementary school students as well as injuring 58 other people. He did it with home made bombs.
I'm going to go a little off here, and I'm sure my opinion won't be popular, but I'll share it anyway. I live in Michigan, and my uncle works for one of the counties here. He drives one of the trucks that transports people doing alternative workforce (as in, when you're arrested and the judge gives you the option of jail time or alternative workforce, where you go along side the road and pick up garbage, as well as other things the county deems necessary; not to be confused with community service). We live near Detroit, and again I'm not trying to be racist when I say this, but in his van each day he has 16ish people, generally all of which are men. Of those, 95% are black. He talks with them while they're driving from one place to the next, and the issue of gun control has come up many times. I remember distinctly one of the conversation he told me about. The men in the van were laughing about, because they said "You fools don't get it...those gun laws aren't for us. You think we care about regulations? We don't register our weapons;
we steal them in home invasions. Almost everyone I know has at least one gun, and not a single one has it registered, and not a single one was purchased legally".
Regulating firearms only works for people who were already going to follow the law to begin with. If you're a criminal, or a soon to be criminal (read: someone planning a mass school/theatre/whatever shooting), there are PLENTY of ways to obtain firearms illegally, and having harsher laws on obtaining guns won't change that at all.