“Even in flush economic times, carbon taxes would be bad policy. When economies are already laboring under too much spending and are at diminishing-return levels of taxation, implementing a carbon tax would be a mistake.”
– Kenneth Green, Dissecting the Carbon Tax, The American, July 13, 2012.
Open-mindedness is a mark of scholarship. And some great lights of classical-liberal social thought in the 20th century changed their minds for theoretical/empirical reasons from a utilitarian perspective.
F. A. Hayek began as a democratic socialist. Milton Friedman started as a FDR New Dealer and Keynesian.  Friedman later in life even moved away from his (naive) view of a fixed-monetary rule where, as he once put it, a computer program could manage the money supply.  Turns out that ‘money supply’ is not a fixed, known quantity; turns out that money is a government monopoly subject to politics.…