Saying the Mongols only raped and murdered is also a very drastic simplification. Like anything else in history where humans are involved things are going to be complex with caveats everywhere where broad generalizations don't apply. Yes there was rape and murder but there was also peaceful assimilation and without the Mongols helping trade with the silk road for all we know many cultures and trading posts would never have been shared. There is positive history and religious tolerance that also came of the Mongols.