Hitler's Chappaquiddick

Ron Rosenbaum worries in Slate that Norman Mailer will make too much of Hitler's sexuality and weirdo relationship with his niece, Geli Raubal, in Mailers new tome on Hitler. Geli Raubal killed herself with Hitler's gun September 1931 in Hitlers Munich apartment, just as Hitler's political star was rapidly rising, hence Hitler's Chappaquiddick.
I wonder why people obsess about Hitler's sexuality. If he was a pervert does that change how we think of him? If he wasn't, is that so shocking? There is nothing unusual or special about murderous dictators or perverts for that matter, history and capitals throughout the world are full of both.