Pakistan feel compelled to pursue a forward policy in Afghanistan, if Afghanistan do not do the same, Pakistan will not learn from its mistakes and because of Pakistan's mistake the whole region will be in problem forever. After the cold war East and West forgot to be involved in Afghanistan, if Pakistan and Iran was not involved in supporting Mujahedeen’s internal fighting, today we would have a peaceful and productive Afghanistan.
Pakistan ambassador to the United States Husain Haqqani sys:
I think that there is no need to worry that Afghanistan will come over and seize the Pashtun area. They are too small and too weak. Pakistan feel compelled to pursue a forward policy in Afghanistan, which has not been to our advantage. It would be much better for Pakistan...by not getting involved in Afghanistan’s internal affairs.
How did America contribute to creating a dysfunctional state in Pakistan?
By building military wherewithal, hoping that Pakistan would be useful in its war against communism, Americans ended up fueling conflict on the subcontinent. So there was this thinking that if Pakistani leaders were saying that they want to fight communism then Americans were supporting them without questioning that. But the Pakistani leadership was not interested in fighting communism; they were thinking of regional conflict and were trying to assert control within Pakistan. So by not understanding what the Pakistan military wanted, what Pakistan needed and what the consequences of arming Pakistan would be for regional peace, the Americans contributed to creating a dysfunctional Pakistan.