Read the history of Indian subcontinent from around 1000 AD to 1947 AD. Events of the same magnitude as the holocast (or worse) happend again and again. Read about the ‘conquests’ of the likes of Mahmood Ghaznavi, Muhammad of Ghor, Taimur the Lame, Ahmad Shah Durrani, Nader Shah, Mughals and countless others. Read about the atrocities committed by them to the people they conquered and tell me that the Nazi holocast was a singular event.