Paul Krugman: Scary Movie 2

Attacking Iran would be a catastrophic mistake, even if all the allegations now being made about Iranian actions in Iraq are true.

But it wouldn’t be the first catastrophic mistake this administration has made, and there are indications that, at the very least, a powerful faction in the administration is spoiling for a fight.

Before we get to the apparent war-mongering, let’s talk about the basics. Are there people in Iran providing aid to factions in Iraq, factions that sometimes kill Americans as well as other Iraqis? Yes, probably. But you can say the same about Saudi Arabia, which is believed to be a major source of financial support for Sunni insurgents — and Sunnis, not Iranian-backed Shiites, are still responsible for most American combat deaths.