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The heart of the matter is that kids do play these games. Even if it's banned in a country, kids still play them. Making them banned, or restricted only makes kids want to play them more. The problem is not the government agencies, it is game makers who purposly go beyond acceptable amounts of gore to make their game appeal to a younger, or atleast a less educated, audience. This is not artistic expression, this is marketing. If they can make a violent game that just barely passes through the censors, but still causes news and media to report on them, their job is done. The rationale is that if someone thinks a game is so wrong, you're going to naturally want to see what they're talking about. The sales of GTA 3, Vice City, and SA all went up after the games were featured in the news when some idiot decided to blame them for their own stupidity. The sales of GTA:SA went up when the press got wind of the "hot coffie" additions. Even though these games are labeled for adults, they are still targeted toward mindless children, and many people still see videogames as being something Adults don't do. The press doesn't mention that these games are designed to be played by people over 17. And they still show the same footage from Doom every time they talk about video game violence. Doom people! It's a game so old that those who were around playing it for countless hours are recieving social security checks. Clearly it didn't turn Generation X or Generation Y into the sociopathic murderers that they expected.
Any instance of violence witnessed by an individual increases that individual's likelyhood toward violence. The difference between movies and vidoe games is in duration and perception. Most people don't watch violent movies for 4-8 hours a day, 3+ days a week, most gamers play for atleast half that time, and often more. There is also a different perception between watching commit violent acts, than there is when you press the keys to commit the same act. More over movies usually paint the violent act in a negative light, while games make the violent act just part of the game, something which you will have to do. This difference causes people who play videogames to percieve violence as an act which has to be done, and puts them in constant exposure to that violence so that they become numb to it.
Even though one session of GTA won't make you run out onto the street, steal a car, and look for some hooker to beat up, it will affect you. People who have played the game have been heard mentioning feelings along the lines of "I was just tempted to get out of my car, and beat the hell out of that guy walking down the street for no reason". Or "I was tempted to blow through the red light and run over some people at the crosswalk". Believe it or not, I've actually heard this stuff from normally stable people. After playing the game myself I was tempted to commit a violent act without purpose or regard for my own moral code.
The truth is that there have been more than enough studies done to link videogames and violence, and the results are rather condemning. Just because you make things rated for adults doesn't mean jack. Often you have people below the age working in the places that sell these games. Even those right around the age might be tempted to just look the otherway if they see a classmate or someone they know wanting to buy it. Then you have parents who spoil their kids rotten. If the kid (even teenagers) whines and screams enough, they can get whatever they want. As parenting in general goes down the toilet, this problem will only continue to get worse, and naturally nobody wants to be told about how they're a bad parent, so some other reason has to be given.
Thats a Very good point, i also agree with what you said about GTA. theres has been a few cases where a kid has been sent to court and as a defense, has blammed a game for his or her actions.
and yes, us aussies always break the laws of ratings. most of us dont really care, you could walk into a video store at the age of 11 and hire Dusk Till Dawn.
Its just bullpoo, why we cant get Rated r Games here let alone anywhere in general just sucks. the government should really get onto it.
PS. sorry if it is'nt much of a good reply. i just woke up.

-EDIT- haha!! it turned into bull poo!!