Its a classic security dilemma:
As US forces continues to encircle Iran, in a bid to halt Iran's development of nuclear weapons, the threat itself enhances the political logic inside Iran for trying to develop a deterrent against attack.
Previous attempts as de-escalation have foundered on the unwillingness to offer Iran sufficient benefit(s) for reducing their commitment to nuclear force; its difficult to see how making Iran & Iranians even less safe is going to help.
