What I wrote about the Pakistani spy agency two years ago:
Speculation Alert: It's important to note that the ISI cares about its self-interest -- it doesn't give a fig about Pakistan. The ISI has provided funds for Islamists in Jammu and Kashmir. It has even been accused of terrorist activities in mainland India. Plus, it provided support for the Taliban. This group has a flamethrower policy for practically every neighbor of Pakistan.
ISI would ideally not want a non-Islamist and a US-supporting government in Kabul. If it couldn't succeed at preventing that, then, at the very least, it would want to make life for the Allies utterly miserable. Ultimately, it's about making the cost of democracy high -- in terms of blood and treasure. Of course, the ISI would only do such a thing covertly.
American intelligence agencies have concluded that members of Pakistan’s powerful spy service helped plan the deadly July 7 bombing of India’s embassy in Kabul, Afghanistan, according to United States government officials.
Par for the course.