I might just be suffering from availability bias since I was reading about the French Revolution right before I read the quote, but I was thinking that so much of what we do that is non-rational (not based on explicit reasoning or weighing of evidence) could be adapted to our social environment through memetic evolution. If this was the case, dropping norms of behavior or social institutions simply because we don't have sufficient rational justification for them might prove disastrous.

Does this sound crazy or am I making sense?