I think you hit the nail on the head. :-)

I've written more than one piece on "nice guys" (in Italian), and I agree that all of them are somehow dominated by FEAR. And no woman is ever attracted to fear.

I think that fear is the least attractive trait a "nice guy" can have. And it's also the least masculine (in an archetypal sense).

Of course anybody can have fears: it’s just human. But a strong masculine man will confront his fears, and try to overcome them. OTOH, a “nice guy” or “Beta” man is dominated and subjugated by them. There is a big difference, and women sense it.