??? Not sure about the Comanche, but the Mongols were excellent administrators. They set up the most efficient postal system the world had seen. When they realized they needed written records to govern their vast empire, they threw together a committee and invented a writing system. They also had pragmatic priorities, promoting science, medicine, engineering, technology -- areas that the established elite of the "civilized" kingdoms they conquered often neglected because these were regarded as lowly crafts. Unlike the "civilized" peoples they conquered, the Mongols did not kill or burn people at the stake just for believing in a different god. They enforced religious tolerance, and even encouraged interfaith dialogues. Pax Mongolica wasn't a pax for nothing.

"Infrastructure, centralized government, and commerce"? Yeah, the Mongols had all those.

The killing and burning they reserved for war, and they did that very well, too. That's how they got their reputation.