Invading Iraq to Stop Terror Attacks

Is it okay when Iran does it?

After Turkey had pretty much threatened to do the same thing, one wonders what reason the American military could give for declaring such actions unjust.

I'm sure that everyone involved in the invasion and occupation is eager to protect the Kurdish areas as they represent the one real glimmer of success in Iraq for now. If the Kurdish paramilitaries tolerate the more radical Kurdish separatist groups using Iraq as a base to attack Turkey and Iran, surely they will both respond.