I completely agree the Mongols were such brutal conquers.

How did the Mongols help advance and manage the trade routes?

After defeating the wretched Mongols at Kitbuga I felt victorious.

The Mongols killed my people they were an atrocious group of people. - Qutuz (Mamluk sultan of Egypt)

As the Mamluk Sultan of Eygpt, the Mongols were my enemy. They were horrendous uncivilized beings.

Lastly, the Mongols were uncivilized because they helped spread the plague again at people who didn't comply or resisted being conquered by them. In doing so they killed millions by this.

The Mongols were also uncivilized because they burned down millions of cities/villages if the civilians didn't comply with them.

The Mongols were horrendous uncivilised people they ripped out unborn children out of a mother's womb.

Lastly, the Mongols practiced religious tolerance. While many other empires in this time didn't the Monolgs were open to it and were courteous of the people they had conquered.

Another reason that shows how the Mongols were civilized people is that they protected the silk road after they had conquered those regions. The silk roads became very safe and authorized under Mongol rule.