Intelligence as such is quite hard to define. Most of the time it is referred to as the ability to solve a complex problem. This, however, means is has got absolutely nothing to do with education. Intelligence is mental capacity, education is stored information. I think it is really only a genetic thing.
Things get blurry in normal life though, as well-educated people are often considered intelligent.
I hate it when people claim things are genetic without doing their research. By research, I mean find me a target gene, inhibit it, and see if the mouse is unable to reach the end of the maze.
There is research that indicates that "intelligence," or at least speed of reasoning and mental agility are
developmentally based; basically that you go through life and hit a critical point of intelligence, after which our capacity for learning and retaining information decreases. However, it's just a theory which is supported by a few journal articles, there is no scientific consensus on this one.
You'll probably consider him as an evil, cowardly bastard who slaughtered jews, purely for the sake that he could. Nothing could be further from the truth.
He wasn't very cowardly; he was an evil bastard who slaughtered Jews, gypsies, homosexuals, communists, and social democrats; and who imprisoned Catholics and political dissidents in a brutal drive to build a "Grossdeutschland" of "racially pure" and "superior" "Aryan" people (Aryan, in anthropology, actually refers to most people descended from the group of humans who inhabited the Caucasus Mountains so many tens of thousands of years ago). In other words, he was a horrible, mass-murdering dictator who invaded countries because of delusions of a grand German Empire, and massacred anyone who he could peg as a scapegoat in order to solidify his terrible grip on the German people.
Not to mention he illegally seized power and held von Hindenburg, von Papen, and von Scheichler essentially hostage as the SA and SS ousted the democratic parties and occupied their seats in the Reichstag. You think he was democratically elected? No, he had support, but the extreme parties (NSDAP and KPD) both lost seats vis a vis the more moderate democratic parties (the social democrats and the conservatives under von Papen) in the 1932 elections. What turned a loss for the Nazi Party into a victory was the SA's presence over all the meetings of the Reichstag, and the Nazi occupation of the seats won by the communists. Then, van der Lubbe was blamed for the Reichstag fire (Goering almost certainly organized the fire in his capacities as head of the Gestapo [before the creation of the Luftwaffe and the seizure of the government]), and the SA ensured, by threat of arms, that the Enabling Act was passed, giving Hitler complete and utter control of the government, and allowing him to strip the Reichstag of its powers.
Hitler never won an election. He had a minority of seats to the democratic parties, and he and von Papen, and their alliance of social conservatives and militarists, ensured that von Hindenburg would appoint him Chancellor. They pulled the wool over the eyes of the President of Germany, and got away with it (Later, Hitler would have von Scheichler, the Chancellor who preceded him, executed during the purge of the SA, and only spared von Papen in order to use his clout with social conservatives), and then, the SA ensured they had a majority.
In no way was it a remotely democratic rise to power. Knocking out and illegalizing the opposition and threatening the head of state with a war in the streets to make you head of government is in no way a mandate from the people to rule.
At the time, Germany was overrun with jews and a great many of the German and Austrian people had a deep hatred for them.
Overrun? No. Almost all of the leaders of industry in Germany at the time of Hitler's coup were Protestants. Jews were just historically used as a scapegoat; in Russia, in Britain, in France, in Germany, hell, everywhere in Europe from the days of the Roman Republic until about 1955 (Can't forget the Soviet continuation war against democratic and Jewish partisans in Poland). Germans only had a moderate hatred for the Jews, rather similar to the Western democracies at the time (Go look up antisemitism in Britain, France, Canada, and the United States in the interwar years, you'll find it was pretty prodigious), but they had a rather significant hatred for the Western democracies who punished them with the Treaty of Versailles and the war guilt clause. Any great nation so defeated in a war they were told they were winning, even after the abdication of Wilhelm II, and then humiliated and repeatedly thrown into economic pitfalls and invaded by France would have a significant hatred for their oppressors. So, Hitler, with the help of the rather brilliant (And horribly evil) Dr. Goebbels, spent years cultivating and using the stab-in-the-back legend to gain support, and in order to do this, they used the most readily available scapegoat possible; the Jews.
I know none of this will convince you though, it never does convince the supporters of the Nazis. Perhaps it will at least set the record straight for everyone else.