how does not leaving a "footprint" nor leaving something "cultural" make them uncivilized?

In his book, Juvayni stated “The first stones which were discharged from them broke the defenders' trebuchet and many were crushed under it. Fear of the quarrels from the crossbows overcame them so that they were in a complete panic and tried to make shields out of veils [i.e. they did best to defend with very indadequate equipment.] Some who were standing on towers crept in their terror like mice into holes or fled like lizards into the crannies of the rocks”

in Juvayni book, he talks about how he thought that the Mongols had the strength of 700,000 men, how they were smart by rounding up all the meat over a large region and dried it for the winter, how they were quick in battle, and how they were ruthless

Khan and his men Killed up to 4 million where killed, which was 10% of the population at the time, where Very brutal

helped the rapid spread of the Black Death due to the facks that they opened up trade and by catapulting their soldier's dead sick bodies, over their enemies walls, which is insane because the Mongols even thaught about biochemical warfare

In order to keep his (Khan's) troops loyal to him, he told them that even if one person from a unit rebelled the whole entire unit would be killed too

The Mongols increased communication throughout Eurasia by developing the pony express system (Yam System) which was basically like a rest stop for travelers

when destroying a city, the Mongols spared artisans, philosophers, and people with skill, later on they would put those people in multiple parts of their empire which allowed knowledge to spread throughout it

The Mongols dave women more rights than any other society at the time, women could have status and could also divorce their husbands if they wanted too