Doesn't that make him a Columbine copy-cat, more than it would make him a neo-Nazi?
Who says it's an either/or? Klebold and Harris decided to carry out their rampage on Hitler's birthday. Coincidence? Maybe. Maybe not. I don't believe that Klebold, Harris or Cho were committed to nazism, or to any ideology -- they were just psychopathic losers who wanted to associate themselves with something big and scary.