If you're one of those people who still thinks it would be a good idea to attack Iran, you might spend a moment or two reflecting on the past week of events in the Middle East. If a stupid and amateurish video can ignite violent anti-American protests from Tunisia to Pakistan, just imagine what a joint U.S.-Israeli attack on Iran would do.
And don't be misled by the fact that a few Arab leaders are also worried about Iran's nuclear program. Some of them are, though they aren't going on the American airwaves to demand "red lines" and set the stage for preventive war. More importantly, surveys of Arab opinion suggest that these publics aren't that worried about Iran's nuclear potential, which they rightly see as a counter to America's military dominance and to Israel's already-existing stockpile of nuclear weapons. If the United States and/or Israel decides to launch an unprovoked attack on Iran, it's going to be seen in the region as the latest manifestation of Western hostility to Islam, as well as another sign that we are actively trying to dominate the region. Public sentiment will be overwhelmingly against us, and current governments will have little choice but to go along with it.
There are big problems throughout the Middle East these days: civil war in Syria, low-level violence in Iraq, pervasive instability in Yemen, armed militias in Libya, uncertainty in Egypt, slow-motion ethnic cleansing on the West Bank, and a host of others. But no set of problems is so great that we couldn't make them a lot worse.
Stephen M. Walt is the Robert and Renée Belfer professor of international relations at Harvard University.