That's a fallacy, Democracy doesn't mean "let any elected moron lead," it means "leaders should encourage and further the democratic process," to represent the best interests of the people. A Manchurian candidate is pretty much the antithesis of Democracy.
I'm not gonna say anything about Le Pen because I do my best to detach from shitheads beyond checking their legal status, but as a Romanian, I can say that Georgescu's removal was a win for that very Democracy you're talking about.
But... that doesn't really... what?