>In a related study of approximately 350 heterosexual individuals, we collected these same measures in networks of opposite-sex friends, acquaintances and partners. Among these well-acquainted individuals, consensus on measures of mate value was nearly zero. These are the people who know what authors you like, what you wore for Halloween six years ago and what obscure movie you will quote the next time you all get to…
I always hated the term "friend zone" because I think it's really as simple as you have just described. One person likes the other and the feeling isn't reciprocated. It's unrequited love. The friendship part makes things more painful and complicated but I don't think it has any bearing on why the person isn't attracted to the other.
So now it is the fault of the pursuer for not working hard enough or "screwing up" an initial encounter protocol and being pushed into the "friend zone". Which is like a terribly deep gravity well that the will require a tremendous amount of energy to get out of.