I dunno, I would be very wary of any vehicle travelling toward a building and refusing to stop in this day and age.
Yeh...OKC, Columbine, 9/11, Breslan. My impulse is to think the cops over-reacted on this one but I have to factor in things that could have been going thru their minds...like Columbine, the region they're in & the nexus to the 9/11 terrorists, possible internal memos from Homeland Security. And, for that matter, the nature of the school/ enrollment where the dance was being held. There's just too much we don't know for me to come to much of a conclusion.