We had no vital interest in Vietnam, Iraq or Afghanistan, and we spent vast sums of our treasury, both financial and human. We ultimately lost or will lose both militarily and in credibility. So why are we now thinking Syria will be any different?
No one can predict the future, but we can consider the weight of our vital interests, which are next to none, versus the costs of entering another war. A good gambler weighs the risks and costs of losing against the possible benefits of winning. We have to start learning what a good bet is.