I have two issues with the numbers quoted, firstly how many people were actually killed? the 3 million mark is simply not possible. I can go along with the theory that Mujib mistook lac for million, but whenever he might have discovered his mistake, he should have clarified. If it was not possible for him, then the subsequent regimes could have corrected the historical error. Not doing it just gives the impression that they lied and are still carrying on with it. How many people were killed by Mukti bahini and other Bangladeshi groups? We just assume that there was no reaction from the other side.
Anyhow it is an unfortunate part of our history, hence Pakistanis shy away from it (not carrying out any research as to what really happened) giving an open field to Bangladeshi nationalists.