Two things can be true: Adolph Hitler has a peculiar genius, and he is a megalomaniacal psychopath. A stupid person cannot bring about the events Hitler did, and no sane person would do what Hitler did. Hitler has a dream, and that dream is the world's nightmare.
A recent survey widely quoted in the press this past year shows the percentage of CEO level executives who are psychopaths is equivalent to the percentage of psychopaths in any given prison. Hitler is the poster child for this.
Hitler's genius shows during his rise to power shows an ability to think creatively, to change with shifting circumstances, to manipulate the system by cheating in every way imaginable until he holds absolute power. He is ruthless in his personal and public life, and murder is just another tool in his box.
Hitler's salient characteristic is a demonic charisma, an ability to hold his audience and those around him spellbound, to demand utter obedience from his subordinates. He is possessed by an obsessive desire to rule, and his mannerisms are sharpened and honed for maximum theatrical and psychological effect. He has the Devil's own luck, dancing between assassination attempts by sheer chance, listening to a voice in his head telling him to get up and go over there to avoid danger, constantly changing his own schedule at the last minute to the consternation of his security forces but it keeps him alive time after time when many, many people want him dead.
Hitler's great weakness is a progression of diseases treated in great secrecy by Theodore Morrel; probably venereal, almost certainly Parkinson's Disease, which over time creates a rigidity of thought. He is treated with a cocktail of drugs the average addict would kill for, and to keep him on his feet he is given a steady diet of methamphetamine. This spirals him down a decision making process that becomes less and less flexible over time until it is so rigid he is just famously screaming incoherent demands down in the Bunker and ordering non-existant armies to counterattack immediately.
The most frightening part of Hitler is the number of fools who look at that massive pile of dead bodies even today and have great admiration for Adolph as a man willing to make hard decisions today for a better world tomorrow. Looking at the body count at the end of the war; Yak has a point, none of it makes any sense, all of it was stupid by the standards of a normal mind. It is very difficult to honesty appraise this period of history if you fail to account for the demonic genius of Adolph Hitler; he is the straw that stirs the drink, and the dregs at the bottom of his cocktail are bitter beyond compare.