The only thing criminal about this is what he's being charged with from a federal law perspective; his actions were just that: stupid. He was going to gain perhaps 24 more hours of study time to get out of a final exam. Using tor was a good idea until you originate it on a campus network --- someone who knew just enough to be microscopically dangerous on the internet. If articles are being written to use tor to make my personal activities on the internet harder for the NSA to correlate, it's gotta be the one-and-only tool right?
Leave your smart phone at the dorm, give your student ID to a conspirator and have them badge you in at the library, use a laptop you temporarily bought at Walmart 2 weeks ago (which has an excellent return policy within 15 days opened or not), then take a taxi (or walk) down to a local area with free wifi (outside a budget hotel, coffee house or there are still dinks who have open APs), use a fake mac address, and do what you need to do. Kid criminals these days.
I'm sure some slashdotter will bullet-hole that remark, but for making a digital bomb thread 'these days' I'd say you have to at least do that if you were on such a mission to do so. What happened to the "my immediate family member is suddenly ill? I must go see them for a day" excuse? I've never used that personally, but surely you start small and don't play the final ace right away.