Of all the themes we’ve been pounding the table on of late, the idea that a lack of liquidity in certain markets will eventually lead to an “accident” or “adverse event” (to use the Center for Financial Stability’s words) is perhaps the most pressing because with the Mario Draghis and Haruhiko Kurodas of the world intent on monetizing every bit of government paper they can get their hands on, “outlier” events such as the Treasury flash crash that occurred last October ar