I dont believe this, with something as large and world changing an event as what Hitler did, or for that matter 9/11, people just dont want to believe it was either as simple as a group of 50 annoyed clever people who managed to highjack a couple of planes and a decrepit old man realising his insane plan had fallen down around his head, he'd be subject to the most intense and bias prosecution in history and decided the bottlers way out was easier.
People like Mengela and Eichmann, the other infamous Nazis who did manage to escape were nothing and nobodies in the public compared to Hitler, most of the people Mengele feared ended up dead in camps, and Eichmann was much more of a behind the scenes "I can order the murder of 6 million people, but I'm not touching one, you do it" sort of guy, I doubt many outside of a minority could identify him in a change of clothes and a haircut.