My opinion is that open source documentation is like polite dinner conversation: It’s not the proper place to discuss politics.
If an author wishes to use their open source project as a platform to discuss politics, that’s the author’s prerogative. But then, as perhaps in this instance, it could be to the detriment of the project itself.
I know this is a common turn of phrase, but I can not help thinking that if the political conversation is impolite it is because some in the conversation is being impolite not due to the topic itself.