NO Mujib wasn't a traitor. In fact he was a key member of Bengal Muslim League. He was patriotic Pakistani. During military rule East Pakistan suffered lot of exploitation. Still he demanded autonomy at most, no one in East Pakistan thought of complete independence before the March 25 crackdown, not even the hardcore nationalists. Bhutto and Yahya were the traitors. Not Mujib.
Bihari Muslims came to East Bengal during Bihar riots. Together with Bihari Muslims we beat bengali hindus black and blue and achieved separate Muslim homeland in the east. It was supposed to be a separate country as put forward in the Lahore resolution. Yet it was made part of Pakistan. I don't know why? Bihari Muslims were our proud Muslim brothers and sisters, we were so happy with them...but it didn't take West Pakistan even a week to turn them against us, calling us raw agents, traitors and what not. Our fault was we demanded some autonomy. Muslims killing Muslims- it was horrible.
Awami League wasn't allowed to form government even after winning majority....instead West Pakistan army killed unarmed Awami League supporters and leaders without provocation. Mukhti Bahni was formed after that. I am strong supporter of Ummat but I would never support people who exploited us in the name of religion.