@Builder,
I agree with that too. In my experience only a small percentage of people, even brilliant people, have much inclination to think critically. They tend to never question the basic assumptions about the world, what's valuable, what's important, etc. that they formulated years ago.
Critical thinking is just rare, for any number of reasons. Not the least of which Hume set forth pretty well:
David Hume wrote:“Reason is, and ought only to be, the slave of the passions, and can never pretend to any other office than to serve and obey them.”