https://amgreatness.com/2018/10/24/it-doesnt-matter-if
The operating assumption from many on both sides of the political aisle has been that Iran is a rational actor. Former President Barack Obama clearly adhered to this notion and it explains his signature on that terrible Iran deal. What few will tell you, however, is that operating behind Obama’s theory on Iran was the assumption that if Tehran was allowed to develop nuclear arms—and if the United States stepped back from the Mideast, leaving only Israel, the Sunni Arab states, and Iran—these powers would balance each other, creating relative peace.
As with so many of Obama’s ideas, this assumption was entirely theoretical and painfully naïve. Fact is, had the Obama Administration’s deal with Iran been continued, the Saudis inevitably would have bought nukes from Pakistan. While the Saudis may have reasons to be an ostensible ally of the United States, Saudi Arabia is home to some of the most ardent Sunni Islamist groups in the world.
What’s more, the ruling Saudi royal family maintains power through brutal autocratic practices. If the Saudi people were left to their own devices, it is more than likely that they would depose the Saudi royal family and replace them with a Sunni Muslim regime that mirrored Iran’s Shiite Muslim regime. And, if that Islamist Saudi regime had nuclear weapons—even if they remained nominally aligned with the United States against a nuclear-armed Iran—such a situation would hardly be peaceful.
In such a scenario, a nuclear-armed Israel, nuclear-armed Saudi Arabia, and nuclear-armed Iran would square off against each other. It would be a tripolar balance of power. Yet, tripolar orders are rarely stable; no grouping of three powers is likely to be evenly balanced against each other. Because of the inevitable imbalance of power, conflict becomes all but certain. In such a Mideast tripolar scenario, that conflict would be nuclear. Once started, a regional nuclear war, surely would expand into a world war, sucking in other powers, such as the United States, Russia, and China.