I guess you’re right.
The trustees of USC can decide to arrest someone walking on the sidewalk, because that’s equal to walking into the Mayor’s office univited..
If that’s the America you want,
get ready to Be Happy.
Let's say there wasn't any tape. Give me your address and I will arrange to have two goons show up at your front door. They'll stay on the "sidewalk" so that you won't feel that you have a legal leg to stand on. Just let us know the next time you plan to throw a party. On of these guys will have a blog, so that will make him a "journalist". The other guy will hold an expensive video camera. They will talk to people entering your party saying things trying to embarrass you into inviting them inside.
(1) What's the chance you invite them inside?
(2) Do you think you might be inclined to call the police to remove them?
From the USC web site: The University of Southern California is one of the world's leading private research universities, located in the heart of Los Angeles.
Just how do you feel about PRIVATE property?