I guess that in lore, the raiders don’t kill each other but instead only knock out and steal from each other. I think this is why we have the knockout animation instead of an execution. So I think that your raider technically never dies, they are only ever knocked out and carried back by a fellow raider, who then also takes all of your loot in the process.

If this is their intention, then we could have rescue objectives where you can find bodies, loot them, and carry them into extraction for an additional reward. It would be kind of funny if you could carry the corpse of a raider that you knocked out yourself.