For anyone who watched the video, attempts to support the actions of the helicopter gunner seem to be on very shaky grounds indeed. The victims are mostly, or entirely, unarmed and attacking people trying to rescue the injured is an act of questionable legality. This looks like a war crime similar to those committed in Vietnam.
The US has a very bad history in 'judging its own' when it comes to war crimes, only under intense media pressure has there ever been any legal action against the perpetrators, and usually it was limited to the lower ranks.