I grew up with a guy who was really smart. He went to uni and studied all sorts of things - he knew a lot about different religions (particularly eastern religions), and knew a lot about philosophy. The elders didn't like it. He'd make comments that the book study group would balk at, mostly because they didn't understand, or because they thought he was being a smart-arse. He knew who Tolstoy was for sure! He's an engineer now, I believe, and has thus far remained in.
When we were teens another guy showed up in our congregation studying to be a lawyer. Now he was smart, but he married the dumbest JW girl I've ever met. She's not a JW anymore, but not because of any critical thinking she might have done (or any thinking at all). I heard that he married again, and as far as I know he's still a lawyer, and still a JW.
I posted a similar quote in a different thread recently, again from Tolstoy, but this is the only reason I can think of that they can't (or don't want to) see reality: The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of doubt, what is laid before him.
I guess the answer to the question is no, I didn't know a lot of them.