Everyone gets ' bullied' at one time or another as a kid or teen. The problem is the PC bs response not to fight back, not to defend yourself (let's talk and have a group hug).
Bullies are basically cowards. They're bullies when the have backup or are bigger (older). But tell them to 'pound sand' or give them a fight - just once. Even if you get you butt handed to you, odds are they will never mess with you again. They're looking for an easy mark, not someone who will cause them problems.
Caveat; yeah there are the psycho's like Cho who should be in a padded cell but he can't be put there because the PC mopes closed all the nut houses because the nuts have 'rights'. That's working out real well, isn't it.
I have notice some charactersitics of bullies.
-They often feel persecuted.
-They are cowards.
-They are often short fused and get angry easily.
-Many come from dysfunctional and/or broken down families, where abuse and addicition is common.
Cho Seung-Hui sounds more like a bully to me. I read he hit his sister. He also stalked those two girls at VA Tech. Stalking is considered bullying. Bullying can also be in the family and many of it is because of it.