Fact check failure - Hitler actually lost the election to Paul von Hindenburg in 1932, who died in 1933 after Hitler was named chancellor and the president seat declared vacant.
"On a dark, rainy Sunday, April 10, 1932, the people voted. They gave Hitler 13,418,547 or 36%, an increase of two million, and Hindenburg 19,359,983 or 53%, an increase of under a million.". I don't think he ever won a popular vote unless something later was staged.
What happened shortly thereafter, however (and this may be what you were thinking of, but your number is off), is parliament was dissolved and the Nazis won 37% of the Reichstag (the largest majority). Hitler was then offered vice-chancellorship. When a false rumor in 1933 appeared saying Hindenburg was going to be arrested, Hindenburg conceded and made Hitler Chancellor and Hitler took absolute power from there, mainly after Hindenberg, already in poor health, died as I previously said.
Note that Germany had a democracy for 14 years at that point, and all it brought them was poverty - fascism was pretty much what they knew had brought them prosperity. Hitler promised them food and to get them back to work. He actually accomplished those things by creating a commodity based co-currency and borrowing heavily. I agree with you on the sci-fi plot of killing Hitler being pointless. The Nazi chant had words saying they would destroy "that goddamn Jewish republic" - they basically accused the republic itself of being run by Jews. The people supported Hitler also because of the other problem, which was the rise of communism in the east which they feared. Hitler purged communist parties after taking power. Basically, they chose fascism over communism (by choosing the Nazis in the reichstag elections when there also was a big push by communists). The nail in the coffin, though, is Hitler didn't have anything to do with creating the death camps. That was Goebbels with the help of Himmler (Goebbels thought it up, Himmler had complete control of the SS and implemented it). Hitler mostly had Jews taken out into fields and shot, but mostly he tried to get them deported (but lacking a state, nobody would take them).