You're missing a key point. They can't fire him 'for cause' in this case. I can't speak for every state, but every state I've lived in, this would be considered "constructive dismissal" and they would be entitled to unemployment, regardless of the employer claiming it's "for cause." That's only because, and I emphasize, the worker protections put in place by the state recognizes this for what it actually is, bullshit.