What to say...
Yes, this video is very disturbing. I cannot condone this at all. This is more a response to Hannah. What makes these soldiers crazy? Couple of things. Group think first of all. Esprit de corps, whatever you want to call it. The men in your fireteam, squad, platoon, et al are the most important people on earth. Not only do you percieve them to be closer to you than your own families, you will risk your life to protect theirs. Because they'll do the same for you.
Before everyone goes crazy on me, remember, response to a question here.
Also, armies in the western world are broadswords, not scalpels. They are not trained or equipped for this kind of mission. Soldiers (all soldiers, not just Brit and Amer) are trained to kill. That's your job. Cut out all that "Be all that you can be" stuff.
If you place trained killers in the role of police officers, shameful events are to be expected.
Once again, I am not trying to soften the impact of what these men did. People forget that there will be a Day of Judgement. Allah (swt) will judge us all.