First of all, a university having a police force is already crazy.

You’ve already said the university having its own police force isn’t what you are really concerned with.

but dealing with protesters with grenade launchers?

So here’s the part where you keep straw-manning. I’ve agreed with you on this point several times. Tear gas is excessive. I find it hard to come up with a scenario where tear gas isn’t excessive. There should be limits on the amount of force police can use.