IIRC they released a video from an American helictoper, calling it "collateral murder". The video showed a bunch of people, some with guns, milling about in the street. The gunners misidentify the journalists' cameras as weapons. They open fire on the group, then later open fire on a van that attempts to pick up one of the badly wounded men.

The official government story was that American troops were hit by small-arms fire and rocket-propelled grenades, called in reinforcements and attack helicopters, and in the ensuing fight 9 insurgents and 2 journalists were killed. “There is no question that coalition forces were clearly engaged in combat operations against a hostile force,” from Lt. Col. Scott Bleichwehl.

Were these the official government story and the WikiLeaks version you were familiar with? Because by any reasonable definition of 'truth', the government's version is factually wrong and obscures the entire situation, whereas the WikiLeaks version is factually correct and obscures nothing, excepting its use of the word murder.