Mental illness, society's shortcomings and persecution caused Columbine. One of the principal arguments in favor of school uniforms claims that all the persecution in schools comes from the differences between students, which are highlighted because some kids wear designer clothes and others get their latest fashions at the local megamart. Once again, that didn't cause Columbine. Both of the killers came from wealthy families. But let's take a look at the idea that differences between students cause strife and eventually violence.
Kids dress differently, too.
Sometimes, they even try to impress each other. Uniforms would, supposedly, prevent the divisiveness that expensive clothes bring about. The fascists who support uniforms don't really care. My state senator, William Van Regenmorter, is one of them. He claims that because students are different they hate each other and the government needs to make them un-different.