Evil Cannot Comprehend Good: A major component in why Molag Bal's plan falls apart in any ending that isn't the Worst Ending.
This having been said, Morihaus is still depicted as a demi-god with the power of the thu'um & strong enough to lift a giant with one hand, and both he & Belharza tower over other humans. Belharza even scoffs at the notion that Alessia would "open her legs for a beast", and suggests the myth was Ayleid propaganda to smear his family. The mod depicts them both as human, with the idea of Morihaus being a minotaur coming from the fact that he never took off is armor, which was fashioned to look like a minotaur, in front of people.
Demythification : In Elder Scrolls lore, Morihaus is described as a "winged bull man" & his son, Belharza, as one of the first minotaurs.