That’s what I would have thought. It presents safety and liability issues.
Fire code violation
Some conservative speakers have been denied due to the safety and security dangers (meaning leftists acted up).
Problem: good guys (conservatives and common citizens) do NOT fight back with, say, a big parking lot vehicle disobedience to stop anyone from seeing the leftist protest inside. WE obey all the rules and laws. WE would be subject to arrest if we stepped on or shoved a protestor so we don’t.