They were even given a key to the school. So should the students still be held accountable?

Pranks can easily go too far when you're young and dumb. Spurred by the jests and jeers of their fellow kin, kids don't have the restraint to resist being little dirt bags. But how can we, as civilized citizens of the world, help teens and kids learn when they've gone too far with a prank? Scare them straight, of course.