You made a point that is a really good example for a civilized empire.
Mongols would would slaughter entire towns in very harsh ways.
Had a barbarian stereotype meaning unable to reason properly and child-like
Uncivilized characteristics include the quick spread of diseases throughout the region.
The mongols also had support for trade which improved their status
Mongols were civilized because of many reasons including the fact that they established strong capitals and governments within the empire.