Good killers versus bad killers

"First Lt. Jobie Siemer, of the First Battalion, 505th Parachute Infantry, who has worked closely with Sheik Maher in Hawr Jab, said, “There are a lot of good people around here who I know killed a bunch of people, but they were defending their land and they were helping us and that was a good thing." OK, Lt. Siemer. Let me get this straight. So you are saying that there are good killers and bad killers. Good killers are those people who kill but who also help the US, and that would be a "good thing"? Did I get that right? But what if people kill and don't help the US and yet defend their land? Would that be a good thing or a bad thing? Please help me out here, Lt. Siemer. These distinctions can be confusing sometimes.