Replying to Kent State Ice Arena

so i went to the ice rink today to do some summer skiing/free sledding for a summer edit, and theres a ton of snow. im almost done building the setup and the cops, take my license, and warn me if anyone is caught trying to do this again they would be cited and get a ticket. They make me clean up everything and leave. I dont get it, ive always sessioned there before and no one had a problem, i always cleaned up after myself and never broke anything, I even brought my own box rail. Now im gonna have to put the snow in my car and bring it back to my backyard setup. Just letting everyone know so they dont get in trouble...