…the policy would be that every member of the cast, staff and crew would have to be vaccinated and show proof of it. They would, of course, be free to refuse, which is their right. But they still would have no right to work on the production, and to endanger the health of others essential to the show’s success. You can’t rehearse with social distancing, nor with actors wearing masks.
I’ve seen viruses run amuck through casts and ruin shows. Your rights stop when they start adversely and unnecessarily affecting my business and projects. Take your own risks and good fortune to you, but don’t impose them on me.
(Incidentally, I would never produce or direct the show you see above. I consider it unethical to put shows on stage that I can’t stand watching and listening to myself.)