I get why you place your bets with Iran. One of our struggles in the west is understanding authoritarian regimes. We don't get their internal power struggles, or the fact that they lie to themselves routinely. These regimes snap and fall apart without warning in our view, when the facades can no longer be maintained. I think the regime was suffering far more than we know and this deal was their lifeline. However many inside it, think they can maintain the status quo or even humiliate the west further. In their view the west is weak and soft, and they are not wrong to a point. WWII shows what happens when the west resolves itself to win at all costs. Getting us there or even close is a mammoth task however.