Now let's compare video games to movies, a movie like "Blood feast" (1963) was considered highly outrageous when it came out. Nowdays it almost looks ridiculous.
Me coming to your house and punching you in the face, taking all your belongings and then kicking you in the butt would by todays standards be considered outrageous, but don't worry in 10-20 years that will also become accepted and nobody will do anything to stop it, people will laugh at you because games though them so.
These games are fun, true but in every game there is a lesson and GTA4 is teaching you some bad lessons, kids play them and kids will draw wrong conclusions by these games. Last thing we need is sociaity full of people who are accepting things that should be outrageous. And they are accepting them because it's fun to do it in the games.
FlameDuck is wrong, we don't need any psychopaths going out and shooting people, these games will switch of moral parts of our society so more and more things that should never be allowed and accepted will become acceptable. In the end we'll have BigBrother sociaty imposed on us because we don't have any respect for each other nor any morals, big corporation will use this and put us all under their control so they can provide their own version of society.