… is from page 133 of my colleague Bryan Caplan’s indispensable 2007 book, The Myth of the Rational Voter :
The same people who practice intellectual self-discipline when they figure out how to commute to work, repair a car, buy a house, or land a job “let themselves go” when they contemplate the effects of protectionism, gun control, or pharmaceutical regulation. Who ever made an enemy by contradicting someone’s belief about what is wrong with his car? For practical questions, standard procedure is to acquire evidence before you form a strong opinion, match you confidence to the quality and quantity of your evidence, and remain open to criticism. For political questions, we routinely override these procedural safeguards.