'Another Middle East war is the last thing we need. Iran shot down an American drone in the latest sign that Trump and Iran’s Khamenei, may be on a collision course. Both feed off the other, and both have behaved recklessly in ways that increase the risk of conflict. So, whatever the outcome of this immediate crisis over the shooting down of the drone (in which each side says the other is the aggressor), we’re facing very real risks of a cycle of escalation, without good face-saving exit ramps for either Trump or Khamenei. This could get scarier.'