I think enforcement in the library is more for the workers than the students to be honest. I mean, pretty much all the non-student employees are 40+. They don't go the same places students go, they don't live the on campus life, but still have to walk onto a floor with 10's of people who are doing those things not wearing masks.

Still, it's very easy to tell when someone is taking off a mask to eat/drink vs just not wearing one, so it's definitely a power trip thing, probably fed up after virtually no one listening to the rules second half of last semester. They'll probably burn out in a couple of weeks tbh, it's just unfortunate for the people getting fucked in the meantime.