Same question can be asked from ZM, what did PPP government for proper investigation of BB’s murder. They say they knew the murderers then what had kept them not naming and prosecuting those. On one hand, ZM accepted that at the time of BB’s murder, they were so emotional that they talked about division of the country, but after coming into government, such feeling (loyalty with BB) vanished immediately.
In short, they all are culprits and playing with sentiments of poor ppl.