Sunk Costs in Foreign Policy

"Notice Bergen’s implicit acceptance [he takes the side of the generals who want the U.S. government to maintain its presence in Afghanistan] of the idea that we should not ignore sunk costs. Bergen’s presumption seems to be that former General John Kelly, Trump’s chief of staff at the time, would want the U.S. to stay in Afghanistan because he had lost his son there, and Bergen appears to agree with that desire. But that loss, horrible as it was, was a sunk cost. Trump seemed to understand that."