Leftist activists have already been pushing Mastercard, Visa, and others to expand their ban beyond illegal activities, with the eventual goal of demonetarizing opposing political views.Last week, Mastercard, Inc., announced new rules for banks processing credit card payments to pornography websites, designed to combat child pornography and sex trafficking. Unfortunately, for a country whose corporate overlords refuse (or are unable) to distinguish between intrinsic evil and prudential policy judgments, this promising development will likely also serve as a beta test to further attack conservative groups.In December, Mastercard and Visa banned the use of their credit cards on the Pornhub website...