Parents need to do their job and discriminate what is appropriate for children to see.
Discriminating is making the right choice to skip that violent midnight screening with a young child in tow. It means one shouldn't use foul and abusive language to loved ones, or watch violent television programs in front of the kids at home, or spout violence as a solution to mundane problems. Children see and take in all of those examples of bad behavior parenting.
It's called being a responsible adult and more people need to accept it.
I agree with the parenting part, but not the violent programming parts. That is NOT an absolute. My parents let me watch some pretty messed up stuff even when I was still in my single digits. I can recall seeing The Terminator before I even knew how many days there were in a week. As a child, I've seen ALIEN, Commando, PREDATOR, Rambo, Total Recall, the works. But my parents always told me that these movies were fake and that nothing like them would or should happen in the real world. As a kid, I understood that.
I think overall, we are a society that really does tolerate violence and judgmental acts. Take reality TV for example. The entire point of the program is watching mean people pass judgement on one another in how bad they are, and we watch it for the laughs. My favorite example has got to be the MPAA in 2010. There were two films released that year that were serious oscar contenders. One was True Grit, one was The King's Speech.
True Grit featured open racism, on-screen hanging, a minor using a gun, on-screen finger dismemberment, close range gun shots to the head complete with red colored blood splatter, numerous gun fights, a man attempting to murder a minor and violence against animals.
Rated PG-13
The King's Speech featured a scene where the King is told by his vocal assistant to use swear words in an effort to see how the King responds to something he's not entirely used to. Profanity for medicable purposes.
Rated R
Why is violence so easily off the hook when language alone makes a film more unsuitable when it's not even being used in an offensive manner? Even the Batman movies get away with a crap ton of violence from stabbing, explosions, gunshots, neck breaking and even descriptions of disturbing mutilations.
Oh, sex and nudity? Big no no. I still know parents who worry more about the porn that their kids see on their own computers than what they're killing on their game consoles.