Ah yes, Hanlon’s razor. Genuinely a great one to keep in mind at all times, along with it’s corollary Clarke’s law: “Any sufficiently advanced incompetence is indistinguishable from malice.”
But in this particular case I think we need the much less frequently cited version by Douglas Hubbard: “Never attribute to malice or stupidity that which can be explained by moderately rational individuals following incentives in a complex system.”
Fascists love the notion of a natural order, because it gives them license to hold power over people “lower in the hierarchy.” They’ll use anything and everything to establish whatever “natural order” serves their purpose at any given moment, and IQ works quite nicely in a lot of situations.