Yes, the latest report of the International Atomic Energy Agency about Iran's nuclear program is cause for concern. But President Obama must not allow Israel to drag the United States into a war with Iran.
Even if Iran builds a nuclear weapon, Israel can take care of itself. It has a robust nuclear deterrent. Any nuclear attack on Israel by Iran would be suicidal. With up to 300 nuclear warheads at its disposal, the Jewish state could turn the entire Islamic Republic into a smoldering cinder in a heartbeat.
Of course, such a nuclear exchange would be catastrophic for both sides, as well as for all of south Asia. But mutual assured destruction is what prevented the United States and the former Soviet Union from attacking each other during the Cold War. Because nuclear war is inconceivably terrible, it tends to focus leaders' minds. That should be the case for the ayatollahs no less than for Americans and Russians.