It's a public forum and has to survive the scrutiny of standards. We have standards in everything, if that is synonymous with censorship, well, then, I am not afraid of that word. That's like being afraid of the over-used word: racist. Ooohh. Scary. Except most accused of racism aren't. It's just a ploy word used by the opposition to defang one's argument. And also often used when one is arguing in favor of standards.
Is a red light at a traffic intersection an impingement on your freedom? Or a standard employed to prevent chaos, and to create order on the public freeways. (I agree that on your private property you can drive in circles all day if you care to). V's wife.
So by your logic it was right for Homosexual groups to go after Dr. Laura and get her show cancelled. Or it's right for Cal students to shout down David Horowitz. Or UNC students to block Clarence Thomas from speaking at their law school.