All excellent points that miss one salient truism. Taking human life, whether by killing or murder wears on the hman soul. So does living with the death of your comrades. That by itself creates confusion.
What Capt. Kudo needs is some time with his Chaplain...a combat Chaplain. Please be careful with your criticism. He may be conceptually wrong, but it is coming from that place deep in his soul that revere's human life. Nurture it and love it.