Of course, the possibly-harder first question is, what is "rationality"? One person's rational response is another one's foolishness. Most issues really don't boil down to provable logic, so what does it mean to be "rational" on those subjects? Is the word actually meaningful, and if so, how does it really work? Is "rational thought" really anything more than a habit of how one interacts with and applies data?
I suspect some people have already done significant research in these directions. It would be interesting to see if I agree with them at all...