Maybe that's what the Marines thought because it was the truth? Maybe these civilians were murdered by the jihadis that invaded their home after they attacked the Marines? They kill a Marine, take his rifle, and murder civilians. Allah akhbar!
Why is it so hard to conceive that the jihadis massacred civilians and blamed the Marines? It's an effective tactic they will use again.
Because the marines who first said the Iraqis were killed by the IED blast later changed their story to they were killed in a fire fight when they entered their homes. IF the marines are saying they killed them, why blame Jihadis?