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Students were reporting that in the dorm he killed his girlfriend and the counselor who was trying to mediate their argument. But you're right of course to point out that it all looks premeditated. So he may have just known he wanted to kill her and then destroy as much life as possible in his rage.
Is it just me or is this not the first time that one of these mass killings started as a case of domestic violence that just took in a wide swath of bystanders as well? There's definitely a gender component to these crimes that no one ever feels compelled to discuss.