Time and again we hear politicians from different parts of the country profess the virtues of a soda tax. Their reasoning ranges from wanting to improve the public health, by cutting back consumption of unhealthy drinks, to talking about how much revenue it will bring in. This proclivity of nanny statists to push policies to change people’s behavior hues quite closely to Einstein’s definition of insanity: Trying the same thing over and over, expecting different results. Policy makers of all stripes need to abandon their affinity for soda taxes. Put simply, soda taxes just don’t work. Take Berkeley, California, as...