Why Ghulam Ishaq Khan was bent on falsely implicating Benazir and Zardari?

Re: Why Ghulam Ishaq Khan was bent on falsely implicating Benazir and Zardari?

The other dictator knew that most of the cases were fraudulently filed against PPP leadership hence he issued NRO. But by issuing NRO he mostly favored other party who was involved in henious crimes of murders and target killings. I would have prefered he should not have issued NRO and kept those henious crime cases intact to be tried in Pakistani courts.