I wrote a column for the Wall Street Journal last week about the policy debate over whether it’s better to lower tax rates or to provide targeted tax cuts for parents. Since this meant I was wading into a fight between so-called reform conservatives (or “reformicons”) and traditional conservatives (or “supply-siders”), I wasn’t surprised to learn that not everyone agreed with my analysis. James Pethokoukis of the American Enterprise Institute, for instance, doesn’t approve of what I wrote. …why are some folks on the right against giving middle-class families a big tax cut and letting them keep more of what...