"Don't tell me how to raise my children!" - How many times have we heard that phrase of righteous indignation? I think parents are hard-wired to make this response whenever they hear anything judgmental. In this case, I think the parents are free to chose what's right for their kids...it's a free country after all. Being ignorant is a choice they are free to make. But if they know their kids, know the game, and think it's fine for them to play, more power to them. But really, why should anyone care what Rockstar says about parenting? They're in the games business to make money. That's what businesses do.
The people that should be called out are the groups that try to restrict access to adult content for all. For me, its a fight between the "Think about the children!" people vs. "Don't tell me how to raise my children!" people. It's so metaphorically pro-life vs. pro-choice. Rockstar's advice almost translates into "You should think about your own damn children", but tromps over both sides by going one step further to "You suck at parenting". Rockstar succeeds at sensationalism once again.