Please stop reading sentences which purport to describe laws, and then offering your views as the facts.
1. State law prevents local units of government from enacting laws on firearms more strict than that of the state. “Local unit of government” means a city, village, township, or county.
2. Parking lots of the "pistol free zones" are not considered part of the "pistol free zone" under the 2003 CCW law changes.
3. State law prevents CCW carry by someone not a reserve or retired cop in the pistol free zone of "A dormitory or classroom of a community college, college, or university."
4. State law does not prevent carry elsewhere on the college campus.
5. Some colleges pass their own laws banning guns, claiming that they are exempt from the preemption law (#1), above, and that the state constitution allows them to pass general criminal ordinances not related to educational operations.
6. There is a real question as to whether #5 is valid, so that charges have not been brought in any test cases because unlike with the "library" anti-gun laws created by liberal cities after "shall issue", there is real doubt on both sides as to the power of a university and no one feels ready to take the risk.
7. If the criminal ordinances in #5, above, do not exist, then the only power that the colleges have outside classrooms and dorms is the same as any other property owner in the state. That is: If they become aware of the carrying, they can request that the person leave, and if the armed person does not then leave they can request an arrest for trespass by the police.