There's a recent meta thread in politics that discussed new close reason for their SE, and both seem apt for the History SE. Quoting them verbatim:
Speculative
Questions asking for the internal motivations of people, how specific individuals would behave in hypothetical situations or predictions for future events are off-topic, because answers would be based on speculation and their correctness could not be verified with sources available to the public.
Too opinionated
a.k.a. "rant in disguise"
The primary purpose of this question appears to be to promote or discredit a specific political cause, group or politician. It does not appear to be a good-faith effort to learn more about governments, policies and political processes as defined in the help center.
Might there be merit in adding some variation of one of both of them here?