I understand their logic even if I disagree with it. It's a pretty typical stance actually, the belief that if children are totally sheltered from violence and the darkness of the world that violence and darkness will disappear when they grow up without those engrained ideals. These are people who pretty much believe there is no such thing as ingrained instincts, and that everything is a learned behavior.
This is simply a group argueing this platform/idealogy on a higher level than you usually see it. Rather than the occasional daytime TV rant, pamphlet, or guest speakers at a PTA meeting, you have their voice being heard in national level media.
Chances are most of us growing up ran into kids raised by parents who wouldn't let the kids have "violent toys" like toy guns, GI Joes, or He-Man. As a result those kids wound up being ostracized without anyone to play with, developed emotional problems in many cases, and otherwise had problems. This is pretty much those parents speaking their mind, thinking they did a good job, or those with a similar naive mentality. Think of it as 60s "Summer Of Love" rhetoric being adapted to actual child rearing.
The people argueing this point would also argue against comic books, and other super hero programs, pointing at the violence in society as the "obvious result". While typically not running point, these are the kinds of people who have been involved not only in current issues like video games, but have also attacked things like Rock Music for violent and sexual lyrics, and comic book violence in the past. The "Comics Code Authority" which has thankfully died was the results of earlier efforts very similar to this.
I see nothing wrong with action or violence, it's part of human nature, and part of how we are wired. It's something we need to understand and control, but not somehting we need to try and nessicarly supress or get rid of since it's an important part of our species long term survival (a whole differant discussion can lead off of this).
What's more, the problem with this philisophy is that even if one was to argue that it's morally correct on most levels, it's impractical to implement it unless the entire world does it at the same time. "The Price Of Freedom is Eternal Vigilance" is very much true, while people in the US and the Western World like to be very self reflective and critical of our own actions, people who make this point are typically naive about how other parts of the world actually are, there are cultures out there that are not driven by reason and extremely xenophobic, not to mention others that simply want to dominate the world and put their own ethnicity or culture in charge. Countries like China and Russia and cultures like that in The Middle East are not going to suddenly stop being militant, aggressive, and/or xenophobic because the US declares itself a group of pacifists. They aren't going to put flowers in their hair and join hands with everyone like a hippy drug vision. Rather they are going to kill/conquer us, and then start in on each other.
Once we achieve a world unity, which will doubtlessly involve a lot of violence (though most of the work will be done through the spread of ideas) I think there will be more room to make sensible arguements for pacificm, though since it won't be a utopia and freedom will always mean a degree of danger (and the right to disagree with the ideal of pacifism) I doubt it will ever be globally embraced, nor should it be. Whenever I hear arguements like the ones made above I tend to think about the beginning of Larry Niven's "Man-Kzin Wars"... where people like this dominated, and everyone on the planet was a pacifist hippy. The conquering feline aliens showed up and did pretty well until humans decided to re-embrace their warlike nature and demonstrate how ridiculously good at it we were to the so called "ultimate warrior race".
While making current social policy off the potential existance of extraterrestrials isn't a good idea, I think in the long term it's not something that should be forgotten. A lot of people laugh about "little green men" and so on, and for the most part it's kind of ridiculous, however I've seen it proven mathematically that we are without a doubt not alone in the universe. I doubt "they" are visiting us now, but I think it's inevitable that we will contact another sentinent species even if it's centuries or millenia down the road. Simply the possibility means that we should not entirely pacify our species just in case we run into something that isn't friendly.