Does nobody else have fathers, brothers, sons and uncles who they love for the wonderful, imperfect and unique humans they are? Where is the sense of loyalty? How can you possibly cast 3.5billion individual humans into the same bucket?
Because I believe social norms and pressure, of patriarchy, are so strong, that they bring out the worst in the majority of men. For example, in some countries I was reading about the other day, a recent survey showed 60/70% of men hit their wives and that women just expected that as part of marriage. Now, is that because 60/70% are really evil? No, it's for the same reason probably 60/70% of people used to discipline their kids by hitting 40 years ago. It's a social norm, a way of life and it suits the dominant groups to continue it.
I believe those norms are stronger than individuals a lot of the time, which is why the majority end up in the shit with their partners, and there's a minority of nicer more thoughtful people (both men and women) who reflect on what they do and see their partners as proper humans. The odds aren't great though.
There was a brilliant book which showed that in the West men and women start off equal when dating, all seems very egalitarian and domestic, then children arrive and it often reverts back to 1950 distribution of household tasks and emotional energy which is very very hard to fight from inside.
This is all more powerful than individual people. Even my lovely husband, who was brilliantly supportive of my career and would move location for it unlike the vast majority of men in the UK who only tolerate their women's jobs if it fits around their own, had his slightly sexist moments, and had to be actively challenged to step up to cleaning the toilet and parenting on his own his own children all by himself rather than defaulting to letting the woman in his life do it.