Perhaps you can explain, why exactly would the release of details about American prisoner abuse cause an increase in factional tension within Iraq? Particularly when that abuse had been rumored/known within Iraq, and wasn't particularly abusive based on standards set by Saddam. Also, the photos in question were released in early 2004, not particularly closely tied to either the hand over of power or the rise in sectarian violence.
I would suggest that the near civil war in Iraq had a number of contributing factors, the prisoner abuse photos not among them. First, the decision to send in too few forces to control the country initially lead to general chaos and anarchy. Second, the disbanding of the Iraqi army more or less ensured that said chaos would continue and that any new Iraqi government would be unable to secure the country. Third, the policy of de-baathification further weakened the government by removing most/all experienced government officials and strengthened sectarian divisions. Put that on top of the existing sectarian tensions left from the Saddam era, and the outcome was fairly predictable.
If you want to place blame for the countless lives lost and protracted military involvement, I suggest you look to the policy makers who time and again overruled the advice of experienced military and diplomatic officials; or perhaps to the American people, who were too busy waving the flag, supporting the troops, and playing partisan politics to notice that our war effort was being directed by a bunch of people out of think tanks and the executive offices of military contractors. The prisoner abuse was largely a symptom of the same problem. And the reporters, generally had little control over or impact on any of it.