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That's right. The kind of person I described seems like combination of sociopathy + high intelligence + maybe something else. So it is much less than 1% of population.
(However, their potential ratio in rationalist community is probably greater than in general population, because our community already selects for high intelligence. So, if high intelligence would be the only additional factor -- which I don't know whether it's true or not -- it could again be 1-4% among the wannabe rationalists.)
I would describe that person as a charismatic manipulator. I don't think it requires being a sociopath, though being one helps.