Thing is, this is also why America is enemies with Iran - without such an enemy, there is no justification for the $Trillions spent on American war hegemony.
So I think we've found the source of the problem: people want to kill each other because its profitable.
I'm not very versed in ME politics but I think the US's stance is more ideological than pragmatic. The us does not need Iran as imaginary enemy when it has real enemies elsewhere -factions in Pakistan, isil, etc. Even Putin is a bigger threat to US political clout in the world.
On the other hand, because of political history, the U.S. is a very convenient enemy and israel is a good distraction too. But as we know from British and french history, the designation of foe and friend and ally can change when it makes politics sense.
So I think we've found the source of the problem: people want to kill each other because its profitable.