@hypolite I'm laughing, I had exactly the same feeling, like, "god man, I do not want to kill you, why don't you get the hint from that I only use my fists?" The game don't support non-killing instincts.
The opposite was Metal Gear Solid V, which is (by default) a sneak game and disprefers killing, but for me it was too hard to sneak... (I haven't even finished it for that, even that it was very well done.)