We have had several such incidents here, Strathfield, Hoddle Street, Port Arthur, Monash
Or an actual screening system and regular review of this nasty creature's mental state? Just how many times has this happened before - in the same setting, a college, before? Would they allow such a gun possession solution in Australia?
Like Joe Horn did? That works for me.
Instead of taking the lazy way out and not simply checking up on people every once and a while, how about give a damn about your neighbor, in your suburb or in your dorm?