Not that I really care that you think so, but their "crap" provided real sources from the NY Times and quotes of CIA crap head Mike Pompeo himself...
That is certainly one of the reasons...
The only way to win in Afghanistan would be a mushroom cloud on Islamabad and that might not be enough.
I don't think I want to know what your version of "win in Afghanistan" is...
I don't, either. I'm just saying what it would take--to remove Pakistan as a backer of the Taliban.
Pakistan Proper doesn't support the Taliban. They kind of invented it and when it got out of hand, they shifted it to Afghanistan to get it away from them. Right now, if Pakistan presses too hard on the Taliban, they'll be getting killed. The big problem with Afghanistan isn't outside forces. It is a small hardly united nation consisting of a lot of uneducated people that are scrimping away to survive. They are at risk of local war lords and Taliban factions that'll kill them if they don't cooperate with them, and they have no way to be protected. Add the weather and rough terrain and this is simply unwinnable without a massive occupying force.
We can't just "fix it". That'd imply it was in some workable format at some previous point in time.