> where are they wrong?
Probably in all of it. Iran wouldn't have a MAD arsenal, they'd have a small handful that they could pop on a ballistic. We know we can shoot down Iran's missiles. And we know they can't reach America. I'm entirely unconvinced that we wouldn't have launched an attack on Iran even if they had nuclear weapons, because we think we can intercept them, and if we can't, they aren't hitting the homeland.
And on the off chance this defense doesn’t work? No system is perfect. Put another way, would the risk calculation for an attack on Iran be as easy as it is right now?
The point of having nuclear capabilities is to make the risk calculation more difficult. It doesn’t mean you need to have state of the art capabilities.