Are you not familiar with the concept of people getting fired for stuff they do outside of work? How on earth, with at-will employment, could this be unenforceable?

And no they’re not comparable, that was the point of my post. One is enforcing a particular political belief on your employees, the other is a routine public health measure, similar to other vaccine requirements I’ve been subjected to.

PS without this requirement I’m being implicitly required to inhale morons’ virus spray as a condition of my employment.