Sometimes we see Genghis Khan and the Mongol Empire and they’re really bad – they attack defenseless cities and kill thousands of people and make piles of their skulls. They destroyed the whole irrigation system of Central Asia and left it a desert.
Other times, the Mongols seem like they were good – the Mongol Empire made Eurasia safe to travel around in, and helped spread the use of paper and glass and steel and sugar and cotton and other important inventions from China to West Asia and from West Asia to China. Christian crusaders sent ambassadors to make alliances with the Mongol rulers. In China, Kublai Khan ran a totally multicultural empire, with freedom of religion.
Which is true? Can they both be true at the same time?