I think you're mixing two different things here. Discussions about unions, working conditions, workplace policies, fairness, etc. have a direct bearing on the workplace and the people in it. Yes, these things are political but they also directly impact the workplace and the people in the organization. I think these topics are all fine.
That's different from Pam in HR reminding you that she Stands With Israel when you work in a company that has no connection at all to Israel, weapons manufacturing, etc. Or maybe they want to harass you for your own views or trade in conspiracy theories. Their co-workers are a captive audience for these rants because they have to deal with these people to do their jobs.
To me it's not about loving capitalism, it's about not wanting yet one more sphere of life to be a stage for performative displays of tribal affiliation.