What this means is that in practice, when exceptionally rational people see some group feeling good about their beliefs because these beliefs are a revered tradition, they'll immediately smell likely biases and turn their critical eye on it. On the other hand, when they see people feeling good about their beliefs because they are a result of progress over past superstition and barbarism, they are in danger of assuming without justification that the necessary critical work has already been done, so everything is OK as it is.

This sounds like an interesting idea to me, and I hope it winds up in whatever fuller exposition of your ideas you end up posting.