However, personally, I can't agree with this statement. Except for the fringe crazies who are anti-military and anti-America, we are ALL on the troops' side. We support them in that we want them to be successful in their mission and that they come back home safely.
That has relatively little to do with how we view the actions of these Marines. I am very outraged when I see pictures of American contractors and American troops hung naked from a bridge or dragged through the streets of Mogadishu.
On the other hand, when I see our Marines do things that are clearly unethical on the battlefield, I'm upset as well. Not because I feel for the dead Taliban, but because I believe that our military is a professional organization that should adhere to a code of honor and certain values, that these actions violate those standards, and that since our policymakers are professing the moral high ground when it comes to the War on Terror, our troops should be held to a higher standard than the enemy.
I don't think "being on their side," necessarily means that you give them leeway when they do wrong. Understand the action, and why it happened, yes, but don't dismiss or excuse it.