It’s not a safe haven when they’re constantly getting killed by our drones.
If we left now they wouldn’t have to worry about that and could focus all their efforts on attacking us.
Don’t forget that Pakistan has NUCLEAR WEAPONS.
What if they fell into the hands of AQ?
That has pitiful range, “overseen” by China, and frantically trying to be preserved/fixed by western scientist. The arsenal is degrading and needs a lot of work.