Sure, media have their biases - one way or the other; the biggest one is probably that focus primarily on what their readers find noteworthy -- so they pay more attention to some celebrity's new dress rather than to a thousand deaths in Africa.

One reason that excesses on "our side" are more noteworthy is because we tend to believe that we have higher standards than the enemy. Thus, it is more noteworthy when some on our team do not live up them. Also, having incriminating photos did not really help...

In any case, I'd say that any politically-motivated selection bias is the least of the problems, compared with the fate of those that were severely abused or worse.