Here is how your scenario breaks down.

1) According to Trump, their nuclear program was "obliterated" months ago.

2) They still have enriched uranium.

3) The Islamists are still in control --- only now it's the more extreme elements.

4) Unless Trump is preparing for a ground invasion to occupy the country, they will now be pursuing a nuclear weapon at all costs and as soon as possible.

The overall effect of the US attack may well be to make your nuclear horror scenario more likely. Let's see where we stand once TACO is done.