Comment: The question we should be asking is

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In reply to comment: Have you never smashed a hard (see in situ)

The question we should be asking is

why does a guy hell-bent on mass murder and suicide destroy his hard drive? If he's killing these kids and teachers for mass-murder notoriety and he is going to die in the endthen why does he care if they find the hard drive. In fact, wouldn't he want them to?

I bet he had some porn on there that he didn't want anybody seeing. Man, that would be embarrassing for him. *snark*