If your family, and family gaming is so important to you (as it should be) then act like it in the proper ways, and the rest will follow. Educate yourself about the ratings system if you are going to own a console. Don't buy games that are inappropriate for your kids. Don't let them buy such games with their own money. Don't let them go to friends houses whose values are so different from your own. Entrust your values to your kids so that they never have a desire to play a game that you find offensive in the first place.
Rest assured, if you actually parent, your children will not end up playing a game like Mad World if you don't want them to. Then, we can have games like No More Heroes released as intended, games like Manhunt 2 released without dictatorial absurdities entwined, and leave knuckleheads like Jack Thompson with no contrived audience to spit his venom at. Because lack of parenting being a threat to freedom is the real issue here, not some fictional black and white character getting hacked up by a chainsaw on a system that you like to play Carnival games and Cricketz on.