1. There's a fine line between open-minded and irrational, and unfortunately a lot of people end up crossing it. This becomes a negative feedback loop wherein more and more people don't want to risk their reputations by sounding like they identify with irrational / fringe groups or ideas.
2. It's easy to identify genius in retrospect, but prior to being validated, people who really think ahead of their time are by definition in the minority, so they either have to get used to being laughed at / criticized, or give up. So I guess I would say, keep looking for peers who are open-minded but not irrational. I went to Carnegie-Mellon (`03) and knew hundreds of bright people there, but only 1 or 2 who I considered to be able to think out of the box, as you say. They're people worth finding, though!