Rarely, but if the union official gets to chose between more people paying dues and fewer people paying dues, which are they going to pick?
We know that Unions don't oppose salary caps, but they oppose differentials in compensation based on job performance. Seems like that amounts to the same thing? Unless you're suggesting we just pay government workers more and see if we get any marginal productivity out of them.
I can follow your hypothetical right up to the point where the union official commits career suicide by trying to piss off every member single member of the union in a single stroke, and no further.
We know that Unions don't oppose salary caps, but they oppose differentials in compensation based on job performance. Seems like that amounts to the same thing? Unless you're suggesting we just pay government workers more and see if we get any marginal productivity out of them.