As an American I do not want to fight any more Muslim countries, two at the moment is enough, especially when we can't even pay for our own infrastructure. You do not need advance weapons to bring down an empire, the Mujahadeen of Afghanistan proved that, the straits would be closed causing oil to skyrocket (indirectly making Venezuela and Russia EXTREMELY rich) and this would last for years, it is very easy to close that strait. This in turn would cause a global economic recession if not depression, setting the stage for fascistic governments to take hold, think the last great depression and the rise of the third reich. War is never the answer, and finaly americans have realized that, over 70% want out.
from the article: U.S. army chief: Iraq war has sapped ability to fight Iran