You bring them prosperity and the people there could put up with almost anything. It is the same in the past and it is the same in the world he come from
As long as they were not the ones being persecuted, they would not care about other people suffering.
To them, other people business are not their business.
Whether their neighbours get persecuted or not, what matters is that their family is not the one being persecuted.
Aeryon compared China to Yan because it is truly similar.
The Great Steppe is like Mongolia.
But this Yan is alike to China, this Great Steppe is alike to great Steppe but also not quite the same
Aeryon is generous and he has a bit of temperament of romantic hero which is quite different than Genghis Khan which is very utilitarian and very much a man who would do anything regardless of the mean
This made the Mongols under him very efficient. He also treated people, women and anything else nothing more than tools.