Id like to add in on this, there are more dine in theaters than there use to be. Big one in my area would be thluie Alamo Draft House. Quality isnt what it use to be, but is still better than most. They also tend to reshow alot of older movies, will never forget seeing the original Predator movie and they were handing you a kids cap gun with a pack of the round ring of ammo on your way to the seats.
Streisand Effect. I agree with your opinion, if they are hired and paid to preform at a venue, then that type of work should be free of personal message or bias.
If they had paid for use of the venue(basically a tour or show) then that would be a platform they are welcome to explain their message.
That being said, no idea why your are being down voted, you are having a friendly and respectful conversation here, and even I can see merits in your debate.