Well, in the US, in a "right to work state", an employer could say "We don't support the views of this band. We saw that you were there and are going to let you go."

Or

"Data shows you hang out in low income areas, we don't think that aligns with our companies goals."

So the "face your principals" is completely fucking arbitrary. That's the fear.

What on earth are you talking about. An employer can do that in any state, not just the "right to work" ones.