This is the largest point for me and what distinguishes them from "Know and repeat the company value statement." If they take an organizational position in promoting certain values past a certain degree, then they absolutely have a social responsibility to make space for those who would discuss counter-values.
At will employment has historically been a smokescreen for companies to fire people for all sorts of abusive / illegal / poorly intentioned reasons. The fact that they can fire people for saying anything doesn't mean they should.
Is this really the path we want to go down?
Also, Google has already shown it wants to be an arbiter of morals. For example, perhaps its lost in this topic, but on my conspiracy forums what people are upset about is Google apparently has been expanding censorship efforts and have hired certain groups to assist in deeming content innapropriate... Such "neutral" groups as the fucking ADL! So if you have a YouTube video calling Israels occupation of Palestine "apartheid" that's worthy of censorship. Don't even get me started about the Google execs shady relationship with the deep state and certain powerful politicians. Google turned evil a long time ago, and they are only getting worse.
He didn't yell fire in a crowded movie theater. As the Supreme Court decided applies to the government, so should private industry use as their guideposts.
Google just took a public step forward in becoming an arbiter of morals. Which is frightening given how much of the de facto internet they control.