Am I absolutely certain that group bias has impacted historical views of Hiroshima? No, however, I could outline a number of reasons why I think it is worth seriously considering. Frankly, I'm not absolutely certain about much of anything other than logic, and even that admits some doubt.
Further, what people think of me personally has absolutely no bearing on the facts under question here. Such comments are unnecessary, offensive, and only serve to muddy the discussion. If anything, I'd say that the reaction of making personal attacks (or comments) instead of making reasoned arguments against my points serves to illustrate that I may be correct in my observations and that they have hit a sore sport. Attacking the messenger instead of the message is fallacious reasoning. But then, considering the ideological environment here, I suspected as much when I entered into this thread, as apparently for some mere questioning itself is an act deserving rebuke.
The bottom line for me is that I happen to care about the truth very much, and when it becomes apparent that the history of WWII has not been objectively recorded, but rather came from a perspective which was situated in an a highly-charged ideological environment, this gives good reason to doubt its veracity.