Mutilated torso found in Iraq

You know, you read something like this and it makes me instantly wonder about a couple of things:
1. So, we're going to get upset because a Marine killed an insurgent who was likely shooting at the Marine and his buddies a short time previously, and where the Marines had lost troops to booby-trapped bodies earlier; and
2. Islam is supposed to be a peaceful religion?

If indeed Islam is a peaceful religion, then where is the outcry in the Muslim community about acts such as this:

"AS hundreds of insurgents who escaped the US onslaught of Fallujah regrouped for further attacks across Iraq, the body of a blonde-haired Caucasian woman with her legs and arms cut off and throat slit was found last night in a street in the battle-torn city.... It is a female ... missing all four appendages, with a slashed throat and disembowelled, she has been dead for a while but only in this location for a day or two," said Benjamin Finnell, a hospital apprentice with the Navy Corps, who inspected the body."