I don't disagree. That's why I qualified my statement with "ostensibly".

But being really intelligent, at least for the top 1% or so, is often advantageous enough to offset any disadvantages from your class/cultural background etc.

I also wonder whether your "psychopathy" is just "ambition". After all, while intelligence alone doesn't guarantee anything, "intelligence + ambition" takes you quite far.

Personally, I can see how even an honest-to-god meritocratic society ends up with psychopaths at the top. For most people with normal-ish psychology, the risks and stress that comes with being on top of anything high stakes is just too much.