In his book `American Sniper’ SEAL sniper Chris Kyle made it clear that he only considered the terrorists he was fighting, almost all of them, to be “savages”.
Our troops were very conscious of rules of engagement, and adhered to the rules whether they agreed with some of the more stringent ones, unlike the savages who hid behind civilians, or made bombs out of pressure cookers (Here) and artillery shells (over there) and hid them among civilians. Then detonated a second bomb when rescue crews show up.
These are maniacs who believe if they kill other people they will go to Heaven. Don’t beat yourself up over them. It’s not worth it.