@Gunfighter - Neither city has much of a military infrastructure currently. Destroying those cities would not hamper their military capacity. Maybe Dooley was actually talking about bombing other major cities for their military capacity, but specifically mentioning these two cities only has one reasoning, because they are holy cities. Maybe at some point they might have the military infrastructure, and for that reason they might have a good reason, but that's unlikely, and a very specific prediction. The threat of bombing them would work better than actually bombing them.
Contingency plans are constantly updated as situations change, so planning for a specific situation where two cities and many countries are drastically different would have no point. Its an unpredictable situation. Training our generals to think this way while we are at war with Islamic nations that have a limited number of extremists is wrong.
If we were bombed we would gain the support of most of the world in any retaliating war, but using nuclear weapons in response, no matter how large the threat, is largely frowned upon. We would lose that support for that alone. Some of the world believes we were right in attacking Afghanistan (occupying it is a different story), but countries and many Americans are outraged when one soldier kills a few dozen civilians. Can you even imagine the outrage if we bombed these holy cities, and killed millions whether it was militarily justified or not. This would lead to other countries supplying our enemies. Our own people would not support the war, specifically the growing number of American Muslims. Its not strategically sound and its not morally sound. The world has changed in the past 50 years, and people have become much more aware of their ability to prevent these atrocities.