I wasn't thinking of raw numbers, as a percentage of the earths population the Mongols win there hands down. I was think more of killing people to no purpose a rational person would regard as sane. Previous mass murderers generally just wanted to assert control. If you were compliant they might rob and enslave you but they wouldn't exterminate you. Hitler and Pol Pot killed people just because they were not the sort of people they wanted around.I think you should get your fact checker to go over this statement.