By Jonathan Power American Middle East interventionists chide President Barack Obama for not doing more. Why is the US running away from Yemen, why didn’t the US go into Syria and depose President Bashar al-Assad, why did Obama pull troops out of Iraq prematurely, why isn’t he putting “boots on the ground” in the fight against the Islamic State (ISIS)? Why, in short, doesn’t the US use its military might to subdue the stormy parts of the Middle East? The first answer must be that he does not have to be George W. Bush’s surrogate. It was Bush who triggered much of the upheavals with his invasion of Iraq – although ex-President Jimmy Carter bears the responsibility for arming the Taliban and thus the establishment of Al Qaeda in Afghanistan. Why should Obama want to continue to try and mop up after Bush’s dirty work, especially as more intervention is...