It turns out that this was planned weeks in advance, not a guy who just snapped one day. It's a slightly different take on the spree killing mentality, but he felt like he wasn't in control, and taking as many people with him as possible was the one sure way to put himself back in control. He mentioned in his letter that he didn't speak English well, so it may be the case that he was a recent immigrant and targeted people like him who had done better than he did (they were taking an English as a Second Language test.)
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