Yes, excellent post ES. The logic of which seems to be that Saudi Arabia, and certain other Gulf States, are the real threat to world security, rather than various gangs of their proxy thugs.
I have posted elsewhere that if we can embargo other "rogue states" such as N Korea, South Africa, and Myanmar, then logic would suggest the same applies here, if a UN resolution to that effect can be obtained. That of course would immediately deny us of their oil, which in turn would have very serious economic repercussions. It would indeed be a "courageous decision, Prime Minister", but anything less will simply be a re-run of all the other Middle East adventures and turn out for the worse rather than the better I would suggest.