I suggest you take up arms and go fight with the Marines everyday in places like Fallujah for a year or so, (mabey even do a couple of tours like many of them do), then come back and YOU tell us what he might have been thinking.
As for me, I already know what he was thinking, the terrorist trash he killed was payback for the friends he saw felled by other terrorists, or perhaps by this man himself. These Marines and soldiers not only see their own guys harmed and killed, they see what these murderous scumbag terrorists do to their own people every single day. To me the only surprise is that this doesn't occur far more often. AND IT DOES NOT MAKE ME SHED ONE SINGLE TEAR FOR THE DEAD TERRORIST.
Perhaps the real problem is that embedded journalists can easily take things out of context, and shouldn't be allowed on the front lines.