Hitler was NOT elected. His party was successful in the elections which led to Hindenburg appointing him Chancellor.
As for the very limited democracy you mentioned on the Weimar Republic (<20 years) and the Japan thingy (which I don't know enough about to debate, though your comment that Hitler was elected is enough to make me suspect you may not be correct), so what? Remember that Iraq and Lebanon both had short periods of democratic governments in, what, the fifties? Regardless, my point stands. Iraqis are not too "inferior" for democracy to work, and anyone having such a belief is, quite simply, a racist.
Correct. This guy gives a fairly accurate summary of how Hitler became Chancellor and then Fuhrer.
Weimer was not a limited democracy. Germany had one of the freest presses in the world and elections were highly competitive. Just because the voters voted the wrong way doesn't make that any less true.