Like most things, it's our nature causing it, mostly.
Progressivism is full of obvious lies and self-contradictions - but I find it hard to condemn people for acting and creating an ideology according to their nature.
I guess we got worse the last century or two. 
Tough to get at this in full 280 characters at a time but the genes haven't shifted much from that left image to the right one; what changed was that the old religion had built in safeties against gaining status through destructive holiness signalling. 1/2
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If you wanted to be super holy you could go live in a monastery. Great for society; bad for the guy who wants power because of his superior holiness - so that got discarded. Now one *can* signal holiness and get power. The right pic there is a memetic cancerous mutation. 2/2
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A population's genes can change fairly quickly in various circumstances. One historically-new thing since 1750 is the demographic transition. Within a few generations, instead of 30%-50% of children dying, nearly all live. Seems like it might cause big genetic changes to me.pic.twitter.com/tqfMzjEhOY
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