Just like the 1930s in Europe, the Taliban did not stop there. It didn't say "thanks we'll be good now", the Taliban have used Swat as a base, to fight onwards and now capturing Buner District, nearer to Islamabad.
"The Pakistani government appears unable or unwilling to stop the Taliban's steady advance deeper into the territory of this nuclear-armed country"
Is Pakistan a failing state? What will it take for the West to be worried about Pakistan's apparent impotence against the Taliban? Will it take Islamabad to be surrounded before governments wake up and realise that the Taliban is taking over a state that holds nuclear weapons - and if you think a nuclear armed Iran is scary....