An entire brigade of National Guardsmen, in a target-rich environment, and they could only get four kills? That's pretty crappy shooting, if you ask me.
Seriously, most college students don't pull this crap anymore. The children of the anti-american flagburners who protested Vietnam wound up in the back dumpster behind an abortion clinic, while most conservative, Christian students happily bred children.
The students you see trashing this recruiting office come from guys too stupid to wrap it up, and girls too dumb to find a clinic.
Or they were indoctrinated.