how about not supplying each side with arms? How about not interfering with their governance. A lot of our need to be there is a result of their attempting to get even with what we’ve done. Eliminate our interference, and perhaps their revenge stops. An interesting concept?
Art
The problems of the Middle East, including some of the more dubious parts of Iran's own behavior, go far beyond "revenge" for foreign meddling. Without diving down the rabbit hole of the Crusades, Assyria, Pontius Pilate, and Sykes-Picot, Iran is clearly set on making itself a major regional power, and in the future possibly a world power. How they choose to go about this is a big part of the problem. Part of what makes Iran so difficult to deal with is that much of what they seek to accomplish is at least in principle legitimate behavior. Countries are allowed to run civilian nuclear programs and it is not up to other countries to decide whether they "trust" them or not. Countries are allowed to develop domestic missile technology, and the "leader of the free world" is also one of the world leaders in missile tech. On the flip side funding clandestine groups dedicated to violent action inside foreign countries is highly problematic, and when the behavior of such groups is used to gain profound political influence inside the foreign country (Hezbollah in Lebanon for example) others can't help but get worried. Iran has also taken a stance on Israel that could be interpreted as genocidal. This is where it becomes very difficult to untangle legitimate state intentions from hostile and aggressive acts, sometimes committed with plausible deniability, and in violation of international norms. Simply pulling out completely doesn't necessarily solve anything. Unfortunately this situation has no simple solutions, and (not to point fingers at anyone here) in my opinion looking for simple solutions to complex problems is itself a sign of dilettantism. Iran has some right to defend its legitimate state interests against anyone, including the US, but where that right ends exactly and aggression begins is unfortunately more and more murky as time goes by.