As someone from the US, universities having their own police forces is between authoritarian and barking mad. It seems downright at odds with both its proposed functionality and goals. The design seems like it would cynically be used to suppress student movements yet it is mostly used to softball enforcement for sake of reputations and not alienating students.
Having police for demographics seems inherently suspicious from a standpoint of liberty as it is either for undue crackdowns or undue lenience separate from official legal status. To give an absurd yet rationally based hypothetical - if it was official that it was in the interest of the state and people for college students to get more lenient drug and alcohol sentences because they want to encourage a limited degree of exploration to better innovation they wouldn't need a seperate police force because it was already codified in law.
This is distinct from when there are actual practical differences for given groups to be policed - a specialized white collar crime police force makes perfect sense as the needs are different. Similarly military police in a provost [https://en.wikipedia.org/wiki/Provost_(military_police)] role are justifiable.
I'm not saying campuses should go unpoliced. I'm saying that the approach is suspect for the situation even if it is just a stupid historical artifact. Keeping an office of a police station on a sufficiently large campus but part of the normal state or city policing is fine - just because they are part of a university doesn't mean they are outside their jurisdiction. Deciding to have a security force that specifically don't have policing powers but enforce rules 'privately' is also fine.