I don’t think the administration would blink twice about abandoning the entire Iraq adventure if sunk costs were the only issue. But the stakes are obviously a lot higher than that. Putting empire ahead of democracy (bases ahead off security and stability) would seem like a recipe for a even bigger disaster down the road. But walking away could leave an Iraq in chaos — or, even worse from an Israeli-American point of view, an Iraq that slides steadily deeper into Iran’s orbit.