Yeah. I'd invert his assumption. Any reading of history shows a lot of introspection. Read the writings of everyday soldiers in the Civil War. Read any writings from any of the Catholic thinkers of the last 2000 years. Read the Greeks and Romans. Marcus Aurelius was exceptional in his quality, but not in his direction. There are so many such examples throughout history that I think it would be much harder to examples of the lack of introspection.

If anything, I think the lack of introspection is a mostly modern phenomenon.