Old doddering fools like Ron Paul and Pat Buchanan can prattle on all they want but it just doesn't work. When Washington warned us not to get entangled in foreign affairs, it took ships 1 to 3 months to cross the Atlantic. Even before WWII, we didn't Japan could launch the kind of attack they did on Pearl Harbor. Thanks to idiots like Paul and Buchanan, but then it was Charles Lindbergh, et. al.
We all know Iran may not ever get the capability to launch a viable ICBM attack on America, but they don't have to. A few well placed EMP attacks from container ships, and the U.S. could be in the stone age. Spreading a deadly disease like Ebola (see Tom Clancy) through airports and shopping malls, and America is in big trouble.