This is Christian from Defense Tech’s take….
My thought is this: First of all, NO DUH they denied your plan to approach Tora Bora from Pakistan…the risks, both diplomatic and military were too much to contemplate. It’s one thing to have planes flying out of remote bases; another to have an “invading” ground force try an Alpine assault from an area teeming with AQ and their sympathizers. Also…LAND MINES!? Come on, you HAD to have known that would never fly. As if Afghanistan doesn’t have enough of them littering the landscape already. What are we, the Soviets? (their potential words, not mine)…
And here is more info from Defense Tech.