Let's get psychopathic for a moment. No specifics, just yes or no.
Let's suppose you intended to kill as many people as you could (and optionally were willing to die in the process). Would you use a gun?
So you can't or won't think that way? Then think about what the most infamous mass killers use. You know, terrorists. When they really want to run up the score like this week's creep did, do they use guns?
Similarly, alternatives were available here (engineering students probably would have known what some of them were - fortunately we were dealing with an English major). If you can't think of any alternatives, well, never mind what they are. Anyway, would anybody be any happier if the victims had died from another cause?
But we all know that the Brady Bunch will be trying to use this tragedy to advance their totalitarian-friendly agenda.