Somehow the primitive graphics make it more disturbing to me. It's kind of interesting that even at this stage of video game history people were trying to make games in which you kill innocent people. Then again, they also made Custer's Revenge, so I shouldn't be so surprised.
I remember playing this game as a kid in the 70s/80s. It was cool because you got to run over people, but I still preferred Asteroids and Space Invaders. I know deep inside however that when I do kill, what the root cause will be...