Heh, agreed, it was a cock-up, and the pilots were pretty disgusting in their attitude, but it wasn't deliberate to my eyes (or, at least, not any more deliberate than firing a gun into a group of people can be).
One thing did occur to me, though, obviously, the cam from a single chopper involved in a multi-vehicle operation won't explain everything, but why did the reports first go from 'they're carrying guns' to 'they're carrying AK47's and RPGs' to 'We are under attack from AK47's and RPGs' without a single shot being visibly fired?
Edit: And I'm still not certain that RPG wasn't a telephoto camera, but it's very hard to tell, it does appear to be a shoulder-mounted device of some description, so maybe the RPG claim was correct...