HT didn't knew the difference between giving explanatory reasons and justification.
IK was giving reasons for TTP rise and subsequent war of terror(opp. to war on terror), he is not giving justification or approval to it, talks about historically FATA was the most peaceful region and Qabaili/Tribal people were the guardians of the area and border.
And that Jinnah also recalled the forces from these Tribal areas so as to facilitate them and let them live with traditional 'Jirga' laws and tarditions, much swift and better than the judicial system here.
IK added when Pak helped the the US against the USSR and with Mujahideens mostly from the Tribal areas and they considered it a 'Jihad' a holy war and when the US attacked Afghan. post 9/11 the same Mujahideens turned into terrorists by US with a push of the button, and since Pak forces were collaborating with US, the Talibans (yesteryears Mujahideens) who were fighting against the US now turned against the Pak Army.
It's case of not reading Afghanistan and FATA history, it's not just Afghanistan which is called the 'graveyard of the Empires' the Tribal region of Pakistan also had the most casualties of British Raj forces and the region (Afghan + FATA Pak) was never colonised.
Imran Khan has written a book 'The Warrior Race' on Tribal areas history and traditions and visited and lived in the region and he knew the people inside out, another book by him mentioned the region and people, 'Pakistan, a personal history'.
Wish some of the powerfuls who take decisions also read it, or knew the history of the FATA, tribal areas and that of Afghanistan, and US too. US would not have attacked Afghanistan if she knew the history.
Knew the region inside out, lived there and wrote two books.
Another book which Imran Khan wrote, the reason he knew about Pakistan History and of different regions better than most people.