There are two possible conflicts on the table in Washington. One is with Iran and the other with Syria. The Iran conflict is the one that Washington doesn’t want. Its most likely trigger at this stage is an Israeli assault on Iran’s nuclear program. Like most of the wars centering around Israel, this one is existential and of no interest to the philosopher kings in D.C. who wage wars with the grand purpose of making the world a better place.
Washington does not particularly care whether Iran gets nukes or doesn’t get nukes. It cares about History. With a capital H. Libya got bombed because it was on the wrong side of history. Syria is about to get bombed because it’s on the wrong side of history. There are people in the administration like Samantha Power who would like to bomb Israel for being on the wrong side of history, but they don’t think that even J Street and Peter Beinart could spin that as a pro-Israel move.