Like the rest of us, CEOs work hard at being normal. But the job attracts a certain character type. Being optimistic, conquer-the-world types with expensive educations and privileged backgrounds, a few too many gaze into their fundaments and find the view oddly satisfying.
Mostly, such behaviour is kept in check. CEOs are smart enough to realise that real or not, an affable character helps them get ahead. And many are indeed that way inclined.