Have you also considered that while a "marginalized" person might be keenly aware, researched and emotionally invested in discussing these things, a "privileged" person may feel ambushed and distracted by these questions while they are trying to focus on work? The language and obvious expectation in many of these "discussions" is a with-us-or-against-us recruitment for the agenda, often backed up with moral blackmail(e.g. "we're fighting for our lives here and you won't even help us"). At work we try to afford each other respect, politeness and professional courtesy, but from what I've seen, these "discussions" are anything but.
I don't think imposing oneself onto other people like these "discussions" do is effective. Surely you've seen the hyperbole, the aggression and vitriol that goes with them and can imagine how it seems to someone who isn't invested in the agendas? After all you ask to not be downvoted even in your meta-discussion about the topics, what about when discussing the topics themselves?
I agree with the progressive arguments - that you can't just say "no politics in X", that politics are inherent to what you do. What I absolutely disagree with is the tactics employed, and I think they are not just ineffective, they have a negative effect on engagement. People may want to help, but they don't want to feel like they're being coerced to. People may want to discuss, but they want to do it on their terms. People may want to listen, but they don't want to be lectured.
I think this is why there is such a strong push to disengage and ignore these problems - and I agree that they are problems that need discussion and need solutions. The in-your-face unapologetic advocacy, the constant motte-and-bailey argumentation, the extreme emotional reactions to any dissention, the preaching from a perceived moral high ground - these are not a conductive environment for changing minds.
So I agree with you. I'll go even further. It's bullshit to say "no politics at work", and it's hypocritical. I will keep supporting that policy, because it's the lesser of two evils, because I think progressive strategy is counter-productive and a recipe for disaster. I'm happy to have any of these discussions, on a neutral, preferrably anonymous forum, where there is enough distance that perhaps we could have a productive argument. Work is none of those things.