http://foreignpolicy.com/2018/05/08/the-art-of-the-regime-change/
"As long expected, Donald Trump has bowed to his ego, his petulant envy of Barack Obama, his hard-line donors, his new set of hawkish advisors, and above all his own ignorance and walked away from the Joint Comprehensive Plan of Action (JCPOA), the international agreement that prevents Iran from acquiring nuclear weapons. Together with his foolish decision to abandon the Trans-Pacific Partnership, this is likely to be his most consequential foreign-policy blunder yet. It is important to understand what’s really going on here. Trump’s decision is not based on a desire to keep Iran from getting a nuclear bomb; if that were the case, it would make much more sense to stay firmly committed to the deal and eventually negotiate to make it permanent. After all, both the International Atomic Energy Agency (which monitors and inspects Iran’s facilities) and U.S. intelligence agree that Iran has been in full compliance with the JCPOA since it was signed. Indeed, as Peter Beinart points out, it is the United States that has arguably been failing to live up to its own commitments. Nor was Trump’s decision motivated by a desire to counter Iran’s various regional activities, such as its support for Bashar al-Assad’s regime in Syria and Hezbollah in Lebanon. If that were his goal, the sensible course of action would have been to stay in the deal (which keeps Iran from going nuclear) and to line up other countries to join the United States and pressure Iran on these matters of concern. Not only will Trump find it impossible to assemble the same multinational coalition that produced the JCPOA, but Iran is going to be doubly reluctant to negotiate with the United States now that Trump has shown that America’s word simply cannot be trusted."
