Politics isn’t subtle, and these candidates are desperate, but do they have to sound like Michael Moore?…

The loss part is what seems to trouble the Gingrich-Perry-Obama critics, especially in Bain’s private-equity business. Like some 2,300 other such U.S. equity firms, Bain looks to buy companies that are underperforming or undervalued and turn them around.

Far from “looting,” this is a vital contribution to capitalism and corporate governance. One of the persistent gripes of the left is that too many CEOs make too much money even as their companies flounder. Private-equity firms target such companies or subsidiaries, replace their management, and try to unlock the underlying value in the enterprise.

Private equity helps to promote dynamic capitalism that creates wealth, rather than dinosaur capitalism of the kind that prevails in Europe and futilely tries to prevent failure. Sometimes this means closing parts of the company and laying off employees, but the overriding goal is to create value, not destroy it.