Corporations should not be allowed to persecute based on option or beliefs either. Corporations already cant persecute based on sex, race, religion, orientation or age. Why should beliefs be any different?
Employers may not discriminate based on these things. They can let you go for what you say. It's called employment at will and I should have the right to remove someone from my private company who is toxic to our culture. If someone is acting unprofessional, I can see no way to force the company to retain them.
This is completely separate from private publishers and platforms. Should a magazine or news paper be forced to publish anything? Does YouTube not charging you for producing content somehow change their relationship?