But the sector is already doing a good job of being non-shitty without a union. And what about the case where you're in a non-shitty sector, but end up with a s

But the sector is already doing a good job of being non-shitty without a union. And what about the case where you're in a non-shitty sector, but end up with a shitty union, resulting in a net negative for the employees? Do you just say "Oh well, it was for the greater good. Someone else somewhere has a union which is non-shitty, just in case some day the sector becomes antagonistic with employees"?