Melanin is an aggression hormone

Not just a pigment. Biologists know this. It’s found in countless other species.
We even know the reputation of black birds with witchcraft and death.

“Do pigmentation and the melanocortin system modulate aggression and sexuality in humans as they do in other animals?”
http://www.humanbiologicaldiversity.com/articles/Rushton-Templer-pigmentation-aggression-sexuality.pdf

Remember the femme fatale is always black (haired*).

From the abstract:

“Both within human populations (e.g., siblings), and between populations (e.g., races, nations, states), studies find that darker pigmented people average higher levels of aggression and sexual activity (and also lower IQ).”

Yes, they look at IQ too.
It’s a reason Asians try to look paler (even the men).
The classic intellectual is pale. It’s status, it’s about money.
It’s also more ‘civilized’, as in less prone to criminality. This is key to collectivists, such as Asians.

*Historical references to black women e.g. Anne Boleyn, always referred to hair because black skinned people obviously didn’t naturally exist in Europe (they’d be referred to by geography, Moors are common descriptors). An African in Europe wouldn’t do well for many reasons including Vitamin D deficiency. Without imported sources, it can be fatal and the NHS guidelines do target Africans in Europe for warnings about this.
Italians were considered the most passionate women in the Middle Ages (and angry) due to their black hair, closely followed by dark-haired Irish women.
Spanish women were considered mongrels due to Islamic conquest, along with some Italians to this day. Northern Italians are what all Italians used to be, genetically.