Yes, that makes sense now. Is it possible that the Left’s worldview dictates their view of man and the Right’s view of man dictates their worldview?
Granted, man is not perfect in the way that you defined it, but all men have reason, and through reason have the ability to do what’s right (even to the extent that they could do it all the time). To hear Sowell in the interview, it is as though he believes that since men are inherently flawed, they cannot strive for perfection, that they cannot work to do what’s right. I would rather live in a world where people incorrectly tried to attain the ideal than one where everyone believed that no ideal could be attained and simply went with the flow, right or wrong.