On its website, the International Committee of the Red Cross posted a suggestion that videogames aiming to realistically recreate modem battlefields (and only those games) should include, "virtual [in-game] penalties for serious violations of the law of armed conflict, in other words war crimes," so as to avoid trivialization of war and keep bad behavior from being taught as acceptable.
It goes on to explain a few things that will hopefully cool your jets as you prepare to take off into anti-censorship chants and whatever else; firstly, that "the ICRC is not involved in the debate about the level of violence in video games."
Read in full, it's not an unreasonable suggestion (nor is it a screaming mandate) and could actually lead to some interesting mechanics, like how your Arma III teammates will kill you if you squad kill. Conversely, developers could simultaneously pull a Spec Ops and make you feel really bad about yourself if you accidentally kill a civilian.
Video games and law of war [ICRC]