Nearly everyone loses by President Donald Trump's decision on Tuesday to withdraw from the Joint Comprehensive Plan of Action (JCPOA) relating to Iran's nuclear energy program and to reinstate the "highest level" of sanctions while also threatening secondary sanctions on any country that "helps" the Iranians. The whole world loses because nuclear proliferation is a disaster waiting to happen and Iran will now have a strong incentive to proceed with a weapons program to defend itself from Israel and the United States. If Iran does so, it will trigger a regional nuclear arms race with Saudi Arabia and Egypt undoubtedly seeking weapons of their own.