I think this idea of slavery does not match with what historically has been the reality of enslavement. It's not that you need one slavemaster for every slave, or that slaves are kept perpetually in prison.
To have slaves you 'just' need less education, the prevalent idea that they need a master, hard labor and some form of punishment for transgressing. I think this set better describes what has been the reality of (say) women in ancient China or Middle-East, black people under the colonial empires, etc.
But let's just taboo "slave", the main issue is another: a meme that asserts "women are inferior beings and they should be treated as such" does not pose an immediate threat to the surivival of a tribe, and for this reason can be latched into a culture for a very long period of time, in the millennia range. To say that memetic evolution selects for truth is just silly.
I'm not sure if you disagree with my last paragraph and precisely on what.
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