Is it the war on terrorism or war on oil barons? Never exclude propaganda. Politics is a dirty business.
The war in Iraq was never about getting their oil out of the ground--it was and is.. about keeping it there.
"If you get involved in a major ground war in the Saudi desert, I think support will erode significantly. Nor should it be supported. We cannot even contemplate, in my view, trading American blood for Iraqi blood." --- John McCain, New York Times, August 19, 1990. But this time's different.
If Iran is allowed to leave NPT, then they will not have to answer to any state on their nuclear policy, just like Israel, India, Pakistan. Perhaps this is the way Iran will handle this. I don't quite understand legalities of the treaty, maybe some of you can comment.