Video Games are kinda touchy because they're multimedia, they incorporate elements of story, art, and entertainment.

The problem isn't that the games ratings are too low, or that they're too graphic or whatever, the problem is that the ratings are misunderstood or ignored by parents and in some cases that the games are being sold to underage consumers by unscrupulous merchants.

There is not a single game out there that could affect a child's behavior in spite of parental awareness and guidance, unless the child was previously mentally unbalanced.