Well, that's a good point you make. The greatest threat to world peace right now is war between Iran and Israel. If we use history as a guideline, the US won't invade Iran until that nation is weak and it's people are practically starving. Iraq and Afghanistan were the two weakest countries in the Middle East, so we knocked them over. Expect a decade of embargos and other sanctions, followed by aerial attacks on key infrastructure points. When Iran can barely stand on its own two feet, we'll probably find an excuse to invade.