simply put, it's what college is about anymore. Parties, parties, parties. They are having the time of their lives, but this generation does seem to take it to the extreme. Even dry campus break the rules, you can't stop it.
Just hope you raised them right, and hope they will make good decisions. They are trying to find their place in the world, and find out who they are at the same time. Mostly in the end they turn out ok, but like I said it's all up to them.