You want Pakistan to stop the war in the FATA - a war that was begun to deny the Afghan Taliban a foreign base to overthrow Karzai. Recall that the conflict began with an attempt to register and monitor foreign ex-militants in the FATA who were suspected of providing support to the Taliban.
A withdrawal of security forces from the front line would create a safe haven within Pakistan for the Afghan Taliban, it being a Taliban-friendly region without security presence, for a long, protracted war against Karzai and his western backers.