Have you noticed that America’s bankers are seething over proposed new capital rules? What gave it away? Perhaps it was the advertisements that warn of dire consequences for the economy, which blare out during prime-time spots in Sunday-night football games. Maybe it was the not-at-all-veiled threats from executives. Suing your regulator is “never a preferred option”, Jeremy Barnum of JPMorgan Chase told investors on a recent earnings call, but “it can’t be taken off the table.” Or perhaps it was the deluge of letters that recently arrived in the postboxes of the Federal Reserve and other banking agencies.