Many mistakes were made during the war on terror. America, UK, Europe, they all prosecuted innocent people. Its the tragedy of the war. Many have been released, many have not.
But thanks to our free and independant judiciary, such mistakes will not be made again. This time, Justice has been done. There was no evidence to hold Hafiz and so he was released.
You as an Indian should appreciate when justice is done.
Perhaps next time Pakistan and India can work more closely together so that proper evidence is gathered against the man.
But unfortunately the Indians choose ego and pride over cooperation, and now this is what you get. 