Iraq Study Group

Okay, so I've read most of it now. What I don't understand is why the study group believes that Iran and Syria have an interest in a stable Iraq. They rightly point out both Iran and Syria are currently de-stabilizing Iraq. If they had an interest in a stable Iraq, why are they currently de-stabilizing it?

It's called wishful thinking.

UPDATE: All right, well this makes a little bit of sense.