First of all women and men do not prefer the dark triad. A lot of women and men are choosing to stay single by choice. There is a rising in sexless, due to man and women, that have in the curse of their life, came across and connected to one type or several types of tge dark triad.

Secondly is not only immature and stupid people that fall for it.

To understand the complexity of these connections we must be aware that these people with dark triad personalites, have a strong developed cognitive empathy that allows them to scan a person at first encounter, and then the "game" begins.

You need also to understand deeply the concept of love bombing, intermittent reinforcement, devaluation and how these kind of connections are build in cycles of patterns that go through all those concepts on a loop.

No one likes to be abused, maybe only masochists.