If it's some kind of a narration made on RMXP(meaning you only press buttons for dialogues and such) or played from a victim's point of view, then its fine.
The only problem with this game is you play the real-life bad guys, who killed real-life people.
As opposed to fake life? Many kids play WWII games and not understand why you kill someone, no political reason or anything. Just because they
know that they are the enemy, whether or not have done anything at all. The trigger is pulled, they fall over, some of them try to get away but the stick moves and the trigger is fired, again, they are dead.
I'm not against the whole GTA-esque sandbox styled games, but seeing like, kids under 16 play them is ridiculous.