I think there are hard-liners inside of Iran that think it is the right thing to do to oppose us, to seek to destroy Israel, to cause havoc in places like Syria or Yemen or Lebanon, if they don't change at all, we're still better off having the deal.
It seldom happens that a man changes his life through his habitual reasoning. No matter how fully he may sense the new plans and aims revealed to him by reason, he continues to plod along in old paths until his life becomes frustrating and unbearable-he finally makes the change only when his usual life can no longer be tolerated.