Let it rain MOABS in Iran!
You minimize the threat so flippantly...on what basis?
Iran's geology--and the regime's utilization of it--is not the same as Iraq's, and we definitely need the MOP, unless you know something I don't.*
*I was approached by a major military contractor about something like "mapping the geologic resistance to penetration weapons of an unnamed Middle-Eastern country" about 15 years ago. Although I didn't take the offer, I did look into things (soil/rock/structural/etc. info) on my own, and a bit more than just Iraq, and have followed the political developments since. I believe MOABs won't cut it there for the types of strikes that will be require, but that's just my rough non-expert opinion on unclassified data.