To be fair, one person's "politics" is another person's life. When you say "politics" in the sense and context we have here, what does it really mean? It probably means something like "controversial topics related to gender, race, or sexual preference". When you think of it that way, it is easy to see that excluding discussion of these topics could be seen as excluding or devaluing people with non-mainstream characteristics. An example of that would be the "Don't Say Gay" law in Florida, or the US military's "Don't Ask Don't Tell" policy whereby they would allow homosexuals in the military as long as they kept quiet about it.

However, those conversations can be delicate and fraught, so I can see why many people want to keep them to a minimum in certain communities. I have a lot of sympathy for mods that have to moderate such conversations. In general, though, I don't think it makes sense to remove comments or people unless they are clearly malicious. There are plenty of people for whom topics related to identity are alien or controversial or too painful and personal. Simply calling people "sealions" or "concern trolls" or "transphobic" or whatever and removing them from the conversation is not only wrong, but counter-productive, in my humble opinion. I think the vast majority of people come to conversations with good intentions, but different levels of knowledge, conflict tolerance, and interest in perceived off-topic digressions.