Films became extremely gory and realistic even before videogames had more than 16 colors.
Games can become more gory as far as I'm concerned (I felt the gibs were missing in HL2), just as long as they have an M rating.
Part of the population still thinks that every videogame and every animation movie is for kids, which all of you know is far from the truth. If we can get people to understand that concept, parents will think twice before buying certain games or even buying hardware for their kids.
You say a lot of parents can't control their kids properly... There a lot of ways to control access to a PC or a console, at least in your own home.
I sort of feel lucky to have been born two decades ago. I had the chance to play with these before videogames and PCs became our everyday machines.