The army exploited the situation because of a vacuum of political leadership.
I agree with Bret Hawk's analysis, but the politicians who have had the chance to rule Pakistan, are not only poor powerless clowns, but corrupt, evil and equal participants in this topi drama. The army is an institution that needed to be guided by the political leadership of vision. Otherwise, the corrupt forces in its ranks will leech on whenever they will get the chance, and this is what happened. This is true for any institution unchecked.
And since as quoted by Brek Hawk, the primary responsibility lies with the most powerful, which according to the constitution, in any form of civilian rule, is on the commander in chief and the chief executive, ie President and Prime minister. Their powerlessness is then an unforgivable crime. They are not only committing crimes of corruption and incompetency, they are laying to waste and destroying the sanctity of the most important offices of Pakistan.
In no way the corrupt politicians be allowed to overturn their share of blame to the army. Why would I play into Zardar's hand by putting the responsibility on the army in the current scenario when the most powerful offices belong to PPP led government? I am no Nawas Sharif, the fool and the greedy.
I will first demand resignation of this corrupt government, put primary responsibility on the PM and the president, and defer any action to be taken with regards to the military, to a credible government which I would advocate should come through a free and fair election conducted under Supreme Court of Pakistan. That is, I will advocate what Imran Khan is advocating, and right so.