As I mentioned to others earlier, Devin felt this was the last straw and he and Mac shouldn't have to go elsewhere to study just because of an inconsiderate neighbor. Yes, he took it a bit to far, but he was to the point where he felt he was running out of options. As far as the house goes, it's on one side of the campus while the dorms are on the opposite side. The buildings where they take their classes and where the dining halls are located are spread out in between, so they'd lose valuable study time by having to constantly go to the house, and that means lugging all their books with them as well. Since CSU doesn't allow freshmen to live off campus, they'd have to walk back to the dorm afterward, and that was just a bit too much. That's why Devin did what he did.