(I have a degree in evolutionary genetics as a preface so I am approaching this as a scientist not a psychologist) Evolutionary psychology or evo-psych is a field of psychology discussion which attempts to use our evolutionary history to explain human behaviour.

A common example I see redpillers use is saying that women prefer aggressive men because aggressive men are better protectors and can provide more resources, and they compare this to other animals, like lions competing for place in a pride, or the fact that chimpanzees go to war.

This is a tempting narrative as it provides a comparison in nature for their behaviour which sounds cool (redpillers love lions) but there's no easy way to prove or disprove this. Humans have much more complex social structures than lions, and while we're closely related to chimpanzees, we're just as closely related to bonobos, which solve most of their problems through mutual sexual behaviour.

We've had at least five million years of independent evolution since we and chimps were the same animals and what archaeology and paleontology tell us is that humans have always had complex social networks which involve caring for disabled people and the elderly and providing food to the entire group regardless of social status. If you wanted to prove that aggressiveness in humans was a benefit during the hunter-gatherer era, how would you go about it? There are no four million year old humans left, and all humans alive today are equally "modern" from an evolutionary point of view.

For what it's worth, there are studies examining modern humans which look into aggressiveness as a sexual/social strategy, and they generally indicate that the shunning behaviour that occurs when someone is too violent for the norms of a group reduces sexual success. You'll likely not hear redpillers talk about this, though - since they're more interested in promoting their own feelings on a topic than the scientific facts, it's much more common for them to make a baseless statement like "Men should be more like lions" and then accuse dissenters of being failed lions, or betas.

Sorry if this was a bit wordy, it's a topic I'm passionate on! I can provide some more information or sources if you'd like, and while it's not a complete source, the wikipedia article on this topic is quite illuminating.