You don't think that any members of the human race are capable of kindness without socialisation?
Very little. As far as I'm aware from reading a couple of books on unfortunate children who have passed through the critical stage of development without any socialisation (confined in basements and so forth), they have no capacity for language, let alone imaginative empathy.
Without socialisation, there isn't much of a person at all, as awful as that sounds. There was one tragic case of a girl who had been locked up with dogs since infancy. After she was rescued her adoptive parents couldn't cope because she would bark, run around on all fours, and urinate and defecate on the floor.
Of course I think it's good to encourage all children to be kind. But then we're just back at my original point that we're all equal blank canvases and should be raised according to the same standards. That is equality.
Beyond our most basic functions and drives, we have no innate self. The self is created through socialisation.
But while we should raise everyone to be kind and caring, some people have to be in positions of authority; and no matter how well we raise people, human beings being human beings, some of those people will do terrible things with that power. It would be the same in a matriarchy. Imagining otherwise is absurdly Panglossian.