This is not that hard.
Give a nuke missle to the Saudis. Make it a Minuteman 3. 10 MIRVs (Multiple Independently-targeted Reentry Vehicles). With pre-programmed launch, targeting and detonation altitude data that cannot be overridden (they can enter new data all they want, but the original will be what is acted upon).
Then when the Saudis fire it at Iran (and they will – they hate Iran and the Shias more than anyone hates anyone), those ten .475MT W88 warheads are gonna destroy: Mecca, Medina, Riyadh, Jeddah, Qom, Arak, Islamabad, Sanaa, Al Hudaydah, Kabul.
No American fingerprints. Doubtless the Saudis would announce they will be attacking the Persian shia. Doubtless we’d play-along and yammer about peaceful discussions (a paternalistic projection of Western values, BTW). And then when the mushroom clouds appeared over Mecca in addition to Qom?
‘Wow! Who ever thought the Saudis could err that badly in target selection or whatever they did to screw-up these warheads!! Bummer, Dude!’
What’s the problem? They like killing each other. They ENJOY killing each other. LET THEM KILL EACH OTHER.
We can keep pretending in the West that functionally illiterate societies (Egypt, the most advanced Arab nation, is 45% illiterate, for example), can be made into western liberal democracies, and we can pretend that Islam (average fertility over 4) will not destroy the West with demographics within a century, extinguishing all our rights, freedoms and liberties, and we can pretend that there is a non-violent answer to the problem of Islam all we want – but it is only pretense.
The longer we wait, the more people will die, the more freedoms will be destroyed, the more liberty extinguised, the harder it will be to kill Islam. (This also is why the Left does not care about stopping Islam. Blue states and nations have fertility below 2.1 – they are in absolute decline – they have no children and so could not care less about the future.)
And it IS Islam that is the problem, whether you understand or like that – or not.