I don't think of Bezos, Musk, or Gates as exceptionally intelligent. They are lucky and influential, sure. Intelligent? Musk is automatically out just because of his Twitter feed. The other two haven't shown themselves to be particularly intelligent, just ruthless and efficient when it comes to generating profit.
As far as the other side of that coin, I tend to agree. Most of the really intelligent people that have existed have been pretty grey morally speaking.
Hence why I went with fictional examples. At least with Lex Luthor, there's very little grey area in his moral stances.