This is exactly why I don't think it the Jocks. If we consider how cheeky DPC was with AL, I suspect he wrote it this way as a red herring to throw you off. I think the game has conveniently ignored the Nerds (Tri betas). Also after Cathy announces she's quitting teaching, we notice a small conflict between Magnar and Sally at the Dorm party. Because I suspect that Sally wasn't aware of Magnar's plans to set up the Alphas and DIKs to fight eachother without questioning the situation too much from taking the natural animosity between them for granted.
The Tri betas have gone under everyone's radar for too long now. And this would explain the technical inclination to having the ability to install the spy cams in the DIK mansion. Don't forget who plays with those little drones. The hints are extremely subtle, but they're there. So I think Sally is pissed off at Magnar for inadvertently getting rid of Cathy as a consequence of their setup.
The nerds did it!
I said first!