Cho Seung-Hui

The more and more I read about Cho, the more I think his actions could have been prevented. At least some of them. When some people are bullied, especially for a long time, their only release is rage and/or taking their own life.
What I can't understand is why "bullying" is an accepted form of behavior. Why aren't there laws to protect people from this kind of behavior? We developed "stalking" laws.
If people would stop and think before they laughed at someone, made fun of someone, spread gossip about someone, they perhaps the victims of bullying will decrease. Yes, Cho was a very sick individual, and what he did is unforgiveable. But don't some of the students need to examine their own hearts, to determine why they make fun of people? Is it their own insecurities? News reports that students say he didn't have nice clothes. So what? They say his family was poor. He had a credit card to buy weapons didn't he? Where did that come from?
In Florida, when classes begin, the doors are locked. Why isn't that the cases in all schools? Why aren't there metal detectors, or security cubes on these school canpuses?
That campus should have been locked down immediately after the first incident! Cho apparently had time to go to the post office and mail that package to NBC! He apparently had enough knowledge that no one would stop him from returning to the campus and continuing on his rampage!
Just like the killing at NASA, we become complacent in our worlds.