I see things a little differently. Intellectuals often exagerate their abilities - particularly in the arenas of social and economic organization where no one really knows what's going on. That certainly doesn't mean dumb people could do better.
I don't know how you are defining dumb, but emotional intelligence is more important than IQ. A lot of brilliant political leaders and writers are psychopaths like Hitler and Stalin, or boderline autistic like Chomsky. People who cannot accept the grit and chaos of ordinary life are extremely dangerous, and should never be voted into office or allowed to assume power through force.