"The people who say - those who go away will return - tell lies."
Waris Shah (Sufi Poet)
The reasons for the Bengali conflicts with West Pakistan were convoluted. Initially, West Pakistan treated East Pakistan as a colony and never granted it its deserved status as the second half of the Pakistan body. In addition, cultural tensions, language rights and economic and political disparities widened the mistrust. Eventually, momentum took hold of Sheikh Mujib's political Bengali separatist movement, which provoked the Pakistani army to retaliate.
Full report here Asia Times