I exact some satisfaction from the fact that the bully was truly stupid, and he had to repeat a year of high school. But I won't forget it. These kids had to endure this kind of thing for four years. That's quite a lot of abuse. There is only so much of this type of abuse that a person can handle before he snaps.
Some people become withdrawn, others lash out.
This was something that required a great deal of advance planning, something that festered over time, which makes it that much worse. Saying that these factors were a great influence is rather absurd. Many other people dress the same and listen to the same music, with decidedly more peaceful results. Regardless of whether it is possible to link the gunmen with any definable group or fan base, it is unfair to cast the entire group in that light. There are very few issues that I feel strongly about, but censorship is one of them.