Earlier quoted context omitted.
Imagine there had been no Nuremberg trials. The Nazis just got a slap on the wrist and almost immediately let back into politics as usual. That's how we got here. We're still fighting the remnants of the confederacy. Germany and Japan in particular purged most of those elements from their society. Here we built statues to the evil fucks.
Here's a map which attempts to estimate when slavery was abolished across various parts of the world: https://www.reddit.com/r/MapPorn/comments/zsnr8q/year_of_abo... The US wasn't much of an outlier. As a general rule, anyone who tries to use slavery as a skeleton key to understand US politics is most likely an ideologue with an agenda. Sane people don't propose struggle sessions for events which happened 100+ years…
As for the Genghis Khan comparison, I may have made an error. We may just be dealing with severe cognitive limitations here.