Our babies are expensive, and genetic diversity is valuable. So monogamy was better than 1 male and a harem. Men killing other men for threatning their child was a bonus. Thanks prolactin for angry papa's. Basically momma bear mode, but with more muscle.

Plus, maternal death rate was too high to afford males killing our population growth. Thankfully, men took care of their infants together with wet nurses (men and their useless tits!). And women have a break on population growth. Making 2 children reach adulthood defines the amount of children women want. Had we kept this up, we'd be more succesful than panda's! Those fucks won at life.

As for the list on males being dope. It's much longer than you'd think. Especially in birds and lots of fish. Some frogs have involved parents too. Which is impressive considering their cognitive abilities are influenced by temperature! It's just not common in mammals.