Why do you find the need to question it? If you are intent, why not take a trip to Dachau, Aushwitz-Birkenau or Bergen-Belsen? You'll find all the evidence you need and more besides. Your Elvis Presley analogy is pretty poor. Your talking about a single person, not the genocide of 6 million people. I'm sure their fate is well documented from testimonies of their families, Nazi records at concentration camps and witness accounts from Allied soldiers who liberated the survivors.