You'd be a budding pedant if you weren't so stupid.
The post hoc fallacy is simply the temporal case of the more general "correlation doesn't imply causation".
When people promote the theocracy's canon "diversity is strength" while enacting public policy such as Massie's immigration liberalization, they are, like it or not, creating a test of a hypothesis and the expected result should be that "strength" should in some sense appear as a result of such immigration liberalization.
The way the scientific method escapes from the "correlation doesn't imply causation" conundrum is precisely such tests -- such predictions -- and then horror of horrors paying attention to the results!
The tragic thing for you is that this attention to results of experiments is anything but fallacious: It is the only way theories can be falsified.
However, I understand that experimental falsification of hypotheses is incommensurate with your mode of discourse since you are merely a theocratic zombie spouting dogma.