I'm in two minds about it the first engagement.
They are a) just doing their job, and that is to eliminate potential threats. They are looking for threats - weapons (rpg's and ak47's), and they see a long dark object and a shorter dark object. You look for a shadow in a dark wood of something sinister and you're bound to see something you don't like. It's human nature.
But then b) they're looking for things. They're desperate to fire. They are separated from the situation, and so all they are shooting at is images on a screen really. It lacks the emotional connection to the situation and therefore it's a bit more gung-ho. Quotes such as, "Come on, let me shoot!" reinforce this.
The second engagement is downright basic brutatility, and there is no two ways about this.
They want to engage the vehicle, and are LYING, saying they are picking up weapons AND bodies, when it is clearly evident that they're only picking up bodies, which gives them permission to shoot according to the ROE (correct me if I'm wrong here, Rob).
I've been watching Generation Kill recently, and it reminds me of a scene in that. They're driving up towards an airfield that they're going to assault, and they're desperate to shoot. The ROE have been changed to include any personnel in the area as a potential threat. Some people are tending to their camels, and under the ROE one soldier is given permission to open fire by his superior.
It is later discovered that he fatally wounded a small child - he was tending to his camels.
It's got to be a stressful environment to live in, no doubt about it. And all of you guys saying "Well he could have seen it was a camera."
No, you could have seen it was a camera if you were looking for a camera. If you're looking for an AK47 it looks bloody similar to an AK47.