Selection for juvenile traits – low aggression, openness to novelty and new people – likely made us more social, and produced our immature-looking skulls as a side-effect. Ironically, it may have been this sociability and low aggression that made modern humans so incredibly dangerous to these primitive Homo sapiens.
So we partied the others to death?
It’s always violence
In this case it sounds more like cats, infiltrating with cuteness instead of conquering with violence.