People don't always have a choice. Modern war is full of concussive weapons that can deprive you of consciousness without killing you. Also, once out of ammo, you have limited options of avoiding being taken alive.
But your point is well taken, no thinking person would ever surrender to these animals.
You make good points too. There certainly are no easy answers to any of this. It just stuck in my mind, these guys digging their own graves. It was a bit traumatizing to see that.