Now lets assume that we live in a world which is far more perfect than our own, one where the young are not allowed to watch or play anything which they are not yet emotionally and mentally ready for (I say this as opposed to legally allowed as I feel age certificates dont tell the whole picture, what one person can see, understand and process at the age of 12 another might not be ready for until they are 15). I think in this situation you could make an argument that it is in fact better to see more realistic effects of sword slashes and weapons fire compared to simply seeing enemies flash, drop down and then disappear. Going back to Sniper Elite when you see someone die it looks painful at times it has made me cringe and make involuntary noises, it really does hammer home the fact that not only would I not want to be shot and die like this in real life I would not want to do what I am doing to the in game enemies to a real person. Yes you can argue that other people might see this and feel differently you could argue that some might see this level of violence and be attracted to it, that they might in fact feel the desire to replicate it but if you say that and you want to try to use that for as an excuse to try and ban or sanitise something then you need to stop and think about the big picture. Violence has existed longer than Video Games, Video games are not the first medium to depict violence, there was violence in films before and there was violence in literature, in fact lots of classic literature including holy books are absolutely dripping in violence and gore or at the very least the suggestion of it. So surly if you were going to argue for outlawing violence in one form of media then you need to do the same thing with all the others music, film , books.
If everyone would just take responsibility for there own kids and even more importantly for there own actions then there would be no need to keep talking about this and the world would be a much better place.