I'd be more concerned about my child seeing actual violence and gore than fictional violence and gore. Since frequenting sites like Ogrish and Best Gore since my mid teens and seeing real murder, torture, suicide, executions, warfare, graphic accidents, extreme animal cruelty, mangled, rotting and bloated corpses, etc., I must say that I find fictional violence to be rather tame and laughable, for the most part. The only fictional violence that I find somewhat disturbing now is in extreme exploitation movies like Men Behind the Sun, Jörg Buttgereit films and Autumn Underground, but that's because they're about as realistic as movies get (Autumn Underground is basically an extremely graphic simulated snuff film, for example).