Just a quick question to those who argue that you can choose not to kill people in GTA, that are not trying to kill you? Have you ever played GTA and if so, did you make that choice? Even Mario involves killing to some extent, via the crushing weight of an Italian plumber (why don't we scream weightist and racism for that?) coming to bear upon small animals, some of which, do not have any ability or will to harm you unless you directly approach them. I know one person, who hasn't killed anyone in GTA, but played it, not that they made it very far, but they played it for a half hour without killing anyone, they might be more objective than some of the arguers here, but I doubt anyone here could give that view, short of never playing a video game.
Video games are artificial constructs in which there are entities that are modeled, textured, and/or animated, to resemble people, animals, objects, buildings, and ideas. Depending on the nature of the construct, you may apply certain effects to certain entities via certain actions. These entities then respond in a predetermined way, or one of several predetermined results in order to simulate variety or give a sense of randomness, or simply to remove the repetitiveness that a single repeating response can cause. The creators of the construct, or later modifiers, enable the player to effect objects in specific ways. In pong, you move you're player, which is a paddle, to come into contact with a dot that then reflects off of you according to the way you hit it, slowing or speeding up depending on the movement rate of the paddle. That dot then traverses what is defined as an empty space with 2 walls, perpendicular to the paddles, the goal being to get the dot to pass the opponent's side of the screen. The dot is a mathematically drawn circle, shaded in with pixels, which represents the idea of a ball. It is not a ball, it is a virtual entity taking on the appearance of one, with limited believability. You can apply to that entity certain meanings from outside of the construct, but that dot has only the meaning it is supplied by it's creators in the format it was created in; it has no feelings, no imagination, no thoughts, it is an entity in a construct.
Were an entity to be created that could think or feel, then ethics would be a question.