The 'rpg' was a camera, the suspicious positioning was paranoid cameramen not wanting to be mistaken for an rpg user and being shot (sure it made it look bad but he maybe had a chance of taking the footage/picture he wanted without issue, as opposed to standing in broad daylight and definitely raising suspicions)
I read somewhere in connection with the footage when first released that stated that AK47s were very prevalent in the area and the journalists most certainly would have taken (similarly) armed guards with them for protection. But my memory of it is unclear that may have just been slashdot comments.
I originally saw the full version which was released by wikileaks http://www.youtube.com/v/is9sxRfU-ik
But I also saw the edited version wikileaks released on http://collateralmurder.com/ and they absolutely do NOT edit out these pertinent points as you state. And released the full version at the same time on the same pages.
They just point out in the edit that the two guys walking across the street actually just have cameras slung over their shoulders. The two guys further back are still fully in view possibly holding ak47s.
As an aside I hadn't seen the interview video on there until today, very disturbing :-(
According to the Canadian 2007-documentary War made Easy, civilian casualties in war rose from 10% in 1WW to 90 in the Gulf War
WWI: 10% of the dead where civilians
WWII: 50%
Vietnam-War: 70%
Gulf-War: 90% (not sure if they where talking about the 1991-war or the 2003-war)
And this with the 'most accurate weapons known to man'