The French government is trying to reign in its deficit by jacking up taxes, including the capital gains tax, which it wants to bring to the same level as the tax on income earned by the sweat of your brow—an old philosophical pillar of the French left. But an explosive essay published last Friday hit a nerve with entrepreneurs, venture capital investors, artisans, and mom-and-pop business owners. And their anger, which spread across the social media, the papers, and finally TV news, turned into an open revolt. The trigger was an editorial in La Tribune by John-David Chamboredon, Executive President...