> Losing one's job is generally understood to be a catastrophic outcome for people in our society, especially when someone has been doing that job for a long time (and perhaps also doesn't have the educational level to get another job at anything close to the same compensation)

I haven't seen any mass protests about at-will employment. Why not?

> It follows that "do X or you're fired" is a form of force or coercion.

But we've had these things around for decades. Vaccines have been required in other jobs, tests have been required for jobs, and yet no mass protests. Why not?

> Threatening someone with a severe material consequence and then saying "it's not force because it's your choice" isn't an argument most people are going to accept, and I find it interesting that you're resorting to it, because it's surely not the strongest argument for your position.

It actually is the strongest argument, because it's true. No one is being forced.