Actually, imo, it was all about how we present history to our masses.
We all know whom v get liberation from-The English but we are taught that it was Hindus who were oppressor. Why don't v have the animosities for Britannia than we have for India? Same is like with Bangladesh.
Thing is we are taught the history which is distorted and which starts from certain date as exactly in this case After 71. So whenever a balanced n neutral writer or reader read history he connects it with the bigger picture...