But .. our military has rules against this .. so why would the leader of the group allow them to do that ..??
We have to fight monsters .. but we don't want to turn our precious warriors into monsters too. Just because the terrorists burned our guys on the bridge in Baghdad, that doesn't make it okay for us to burn them. No matter how much we dislike them. We're there to kill and break things - not become butchers and monsters.
I really do think it was done for expediency. Bloated, stinking bodies, high heat, other tactical considerations...all conspire to make it far easier to burn them than bury them. I really don't see what the big deal is, the guys were already dead and if some jerk hadn't photographed it, it never happened.