Because it is State intereference to reduce individual freedom.
No it's not. The state is not stoping annyone from using it. It's simply a prohibition of distribution of it, in the capus that are property of the state anyways.
Right, it is State interference in the freedom of distribution.
By state offices in state property?
Yes, obviously. What business does the state have in proscribing some activity that is perfectly legal off state property, unless that activity somehow infringes on the operation of that institution?
For that matter even some activities that
do interfere with the operation should be allowed, since all citizens should have access to state property - the prime example is free speech on college campuses.