Bin Laden thought attacking the US would drive foreigners from the middle east and bring about a pure ethnostate. Instead the world flooded his beloved area with even more dirty foreigners.
MBS is just another in a long line of rich Saudis doing anything they want because they buy tons of military equipment from us. Don't want to punish your best customer if you are part of the military industrial complex.
The Taliban still don't rule the entire country and if they try too hard, other groups would form to fight them. Their fighters change sides frequently with no real loyalty to any one warlord.
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