I can understand why some who see this footage find it disturbing. I personally, put myself in the pilot's place. All I see in this footage is soldier doing his duty and protecting himself, and I would have done the same.
The act of killing in today's modern world has become very impersonal. In the clip we never see the enemies face and the life leaving his body. We just see some highlighted blobs get shredded, hit the ground, and not move. It is just like a video game, no attachment what so ever. Its come across my mind when I use to targer shoot with AR15/M16 and the targets in person were actually quite big, the size of a person, but just little black dots at 300+ yards. I believe I could easily kill an enemy from 300+ yards away and really feel no remorse. Now if I had to kill and enemy with my bare hands and watch him die, I don't know if I could handle that.