I think people underestimate the degree to which our workplaces shape our values. How can putting "cultural fit"above every other consideration when hiring, NOT make us more willing to cluster only with those like ourselves?

We not only get warm fuzzy feelings from doing this, we are constantly TOLD that we'll get warm fuzzy feelings from it; and that those warm fuzzy feelings are THE most important thing for our happiness and emotional balance. So you get kind of a vicious circle. So we get people willing to end relationships over giving critical but honest feedback. So we get all of us, but bosses especially, thinking that agreement is a requirement for maintaining the relationship.

Disagreement with the boss should not be a firing offense.
Disagreement with friends should not be a reason to sever the friendship.
Putting comfortability above all leads to prejudice and discrimination.