I think their angle is that it’s not in anyone’s favour to unionise.
It parallels the view of government I grew up with.
Never really questioned where this view came from though, but my guess would be persistent long term marketing by interested parties. "Nudging" if you will.
That's what socialism, union's, and co-ops are up against. A sentiment that's been groomed over a long time, that makes you feel like a Commie or a conspirator if you question it.
It's lead me to think that capitalism has become a religion. If you question it you get labeled subconsciously by otherwise reasonable peers.
Now, do the benefits to the workers in a dirty union outweigh the benefits to working for an abusive corporation? I have no idea.
If there are two corrupt things, why add a third one to increase the misery?
Instead of the corrupt company doing everything it can to exploit employee labor, it has to fight the corrupt union doing everything it can to exploit the corporation. Otherwise if you want to argue that we should remove all corporations like we do unions because of their corruption, then I'd be all for that.
There is something categorically different and I'm not sure how that came to be.
Edit: I'm rate limited for comments. Thank you, my dude, for the recommendation.
Adversarial Legalism by Robert Kagan. https://www.hup.harvard.edu/catalog.php?isbn=9780674012417
Strikes and disruption with unions using the tactics of previous decades - when they had fought for and won sorely needed rights, was no longer fit for purpose. They'd achieved the hard part now were fighting battles fewer and fewer outside the union cared for. When your refuse, electricity, heat or bank is disrupted for a lengthy period, while everyone is struggling, sympathy dwindles quickly. Resentment sets in, even for a fair and deserved pay rise, if it triggers yet another strike.
What does surprise me somewhat, is the complete lack of resurgence, or even much recovery, in US and UK after being effectively neutered during the Reagan/Thatcher years. Europe seemed to fair better, so they have kept more union presence than the Anglosphere. Yet it's pretty clear we need something sticking up for worker rights once again.
Coops are a completely different animal, and I've never encountered or heard of objection or resentment to those across my life. Capitalism, and most especially the modern neoliberal variant are indeed religions, with just as much dogma.