Computer games don't affect kids. If Pacman would have affected us as children, we would now run around in darkened rooms, munching pills and listening to repetetive music.
If it's there and you can see it - it's real. If it's not there and you can see it - it's virtual. If it's there and you can't see it - it's transparent. If it's not there and you can't see it - you erased it!