Why Iran must not be allowed to obtain a nuclear weapon?!
That’s like arguing why the sun must not be allowed to rise. There is no political will to stop them. Iran will obtain a weapon, the only question now is when and how they’ll use it.
Think a 500lbs JDAM would fit down the well?
Recommend immediate destruction of Iran’s nuclear research facilities, its air defense first of course, its air force, its terrorist training camps, its air force, its navy, its weapons and ammunition depots and manufacturing facilities as well, and its secret police. After that, see if they want some more.