"up to 800 hours of footage"? I have never played a game that would last for that long. Most of these "violent" games are usually short, 10 to 30 hours of content, usually around 15 hours. The rest of the game time is just repeating the same content again and again. If you play Counter-Strike for 10 hours, thats not 10 hours of footage. It's just a few maps that you play repeatedly. Every time will be slightly different, but it will be the same content. Saying that a game has "up to 800 hours of footage" is like saying that a 2 hour movie has 200 hours of footage if you watch it 100 times.
There have always been aggressive people and murderers/criminals. Getting rid of violent video games for kids ain't gonna help much. Games CAN cause violent behavior, but so can many other things. Most of the time its the invividual, not the game that is to blame. Parents should know their kids well enough to know what they can handle. This is not always the case, but you know what I mean. It is understandable that games may cause a "brainwash effect" younger children like some politicians say. It's a part of human mental development. I just don't see this as such a big problem as some people blame.
This is a part of the same age old chain of fear that todays children will be corrupted by entertainment business. Even Plato, who lived 400BC, thought that literature and drama plays were corrupting the young distort their sense of moral and give a very bad bad influence from them. It is the same as todays. Today we just do it better.