When people show the kind of disregard for humanity that is shown by the Marine in that video as well as his audience, especially when this disregard is shown toward the very people they claim to be over there helping, they help to create the kind of environment in which an insurgency becomes an inevitability. And to that extent, they are responsible for the deaths of many of their fellow servicemen and women.
If you value the lives of our men and women in uniform, you won't be making excuses for that sort of behavior or that sort of attitude.
And to the extent that an insurgency jeopardizes the mission, any behaviors and/or attitudes that help to incite a backlash against our forces also jeopardize the mission. If you value the mission, you won't be making excuses for that sort of behavior or that sort of attitude.