My thoughts and prayers go out to the families at Virginia Tech.
I apologize if someone has already mentioned this and  I missed it. I find the main theme in these mass killings to be that of a victim of bullying finally snaps. I think that society and schools need to take a more proactive look at seeking out both bullys and victims of bullys and getting them into counseling at as early an age as possible. Both need help and at as early an age as possible. I was a wall flower in school. I tried to blend into the background as much as possible. I got voted the quietest in my class. I was small and afraid of being picked on. Once on a school bus some boys were pulling my hair. I didn't know what to do, I was sitting behing the bus driver and even that didn't get me protection and I got so upset that I snapped and turned and swung my fist at them. Luckily, one kid only had a small cut on his lip and that was the end of it. But I can totally understand the feelings of desperation when one feels unable to cope. However, there is no excuse for murdering innocent people. It is unfortunately a side effect of a mental illness and it will continue to happen until people interveen and help children who are shy get coping skills at a young age.
Thats my soap box. No amount of laws against weapons will change what happens, only getting to the root will help.