Other than buying oil, the US has no business in the mid-east.
Naive isolationism has such a weird attraction to Americans. Buying oil is not like going to a supermarket and buying milk. It is the most strategic resource there is and whoever controls it controls the world. US pulling out of the middle east means a free for all, with Saudi and Iran (at least) going nuclear, and all the small oil producing countries aligning themselves with whoever replaces the US. Russia, China and others taking over the oil industry that we built. How would you like us to be a bitch to an oil cartel and whatever major powers (FAR worse than us in every way) are behind them, with power to screw with our economy any time they want? Some day we may not be dependent on the middle east oil, and may that day come soon, but it is not here yet.
Btw, the public perception of US military is completely opposite from the truth. It is not a weapon we swing around to intimidate and oppress countries. Our military power is an asset that we trade (with Saudis, Qataris, Emiratis, Kuwaitis, Israelis, Japanese, Koreans, Australians, Europeans, and countless other countries that we protect) just like any other asset. In exchange for it, we get less than we spend on it directly, but indirectly we get far more in terms of stability, free commerce, access to essential resources and allies in the UN and other organizations. It doesn't take much imagination to picture a world in which US pulls out, and the chaos that would result.