Foreign policy is not theology. The only way to make sensible choices in this realm is to weigh costs and benefits. A policy that might have been wise crumbles if the costs become prohibitive. For example, protecting South Vietnam from a communist invasion from the north was a worthwhile goal. The horrendous costs of doing so, however, made it a bad policy. For those of us who supported the war in Iraq, the question is simple--have the costs risen so high that they outweigh any benefit?