re: Listening to a podcast, guys says the holocaust is worst crime in history: agree or no?

As a percentage of the world’s population killed/enslaved/brutalized/etc., what the Mongols did all across Europe and Asia (especially China) and what the various Islamic invasions of India did were worse. Timurlane is way up there. It doesn’t get a ton of pub in the US, but what a lot of the armies did in the Thirty Years War was horrific on a huge scale. Modern scholars are starting to make a case that what Julius Caesar did in Gaul approaches that kind of scale as well.