The post was very clearly saying that Ghengis Khan and the post-Mongolian Chinese state is a worse form of conquest and murder because they were conquering and killing their own people.
But the US was killing Native Americans which weren’t citizens, so it is not as bad as killing your own people like the Mongolian/Chinese/Mao.
Yeah, Obamacare was way too generous and left-wing when it was the Romney-care plan before being reduced and heavily means tested.