Use your head. Which book or article tells us of the most likely culprits in the bombing of the Indian Embassy in Afghanistan.
As for rogue elements, one could attribute anything to rogue elements. Any spy agency with an ounce of competence, and let's face it ISI are superhuman, will not have any conflict of interest within their ranks. The elite will discard those whose policy does not favour Pakistan's interests. However, even you would be hard pushed to think of a motive for rogue elements in ISI wanting to bomb the Indian Embassy in Afghanistan. Do you honestly believe that even rogue elements, would expect the Indians to run off from Afghanistan after having sustained 4 casualties when they've sustained 4,000 casualties in Kashmir and are still there? Use some sense at least