You're almost certainly s. o. l. regarding getting the school to cover your loss... count on there being a disclaimer of responsibility somewhere (the school handbook, regulations, somewhere).
I'm assuming your "school" is a college, not a high school? If so, it would be perfectly reasonable for you and other affected parties to request a town-hall meeting with the college's president to discuss what seems to be a growing lack of security on your campus and the school's response to it. Certainly the campus cops should be putting down their doughnuts and patrolling more, maybe putting some cameras in the parking lots, etc. Every college in the U. S. that receives any federal funds (and that's basically every college, everywhere) has to annually report its campus crime statistics to the Dept. of Education. These are widely republished (for example, in the Chronicle of Higher Education), and are by law required to be provided to incoming students. Hence, schools have some motivation, if they're smart, to avoid embarrassment by trying to keep their campus crime down. Look up your school's crime stats in the Chronicle and, if they're high relative to its peers, point this out to your administration and demand to know what's being done to reverse the situation. If they blow you off, do some picketing in front of the administration building and call in the local TV news. Write letters to the editor of the local paper. Embarrass the hell outta them. The squeaky wheel gets the grease.
On the bright side, I think you'll find your insurance will pay for your tires.