Longtime user and Politics site moderator Yannis pointed out that Politics has a custom close reason for these kinds of posts. This seems like a really good idea. Here's what ours should look like:

Push Question - The primary purpose of this question appears to be to promote or discredit a specific historical theory, group or political cause. It does not appear to be a good-faith effort to learn more about History, as defined in the help center.

Note that sites are allowed only 3 custom close reasons, and this will be our third. The other two currently are Trivia and basic facts and Social Sciences other than History.