Science doesn't tell you what is valuable. Any form of government is inherently going to rely on a set of moral axioms to tell the government what to value. The

Science doesn't tell you what is valuable. Any form of government is inherently going to rely on a set of moral axioms to tell the government what to value. The difference between a rational and an irrational government would be that the rational government would be more likely to get results that match what is valued by its set of moral axioms. None of that changes the fact that a government guided by a bad set of moral axioms is going to get bad results, whether it is rational or irrational. On the whole, I think liberal democracies have come up with a relatively good set of moral axioms so applying rationality would be more beneficial than harmful.