I agree with everything you said, DeanSexton. I would just like to add onto what you've already started.
About Video Games being a modern spacegoat. Example: Years ago, a crime spree was committed in one afternoon by a late teenage boy from a poor-middle class family. The reason to why he did such a thing was as reported, he played GTA: San Andreas, twelve hours straight. The media swarmed all over the game and its designers instead of the boy who was truly reasonable.
As generally accepted by the Gamer Community, any gameplay session that lasts more than two hours is defined as "Excessive Gameplaying". The reason I bring this up is because the media said that due to the twelve hours of exposure to this violence and criminal activity was the only reason the boy did such things and the game is solely to blame. This would be true...If every gamer who played GTA: San Andreas for twelve hours committed crime sprees.
A very possible reason the blame wasn't placed on the boy is because the Video Game Industry makes money...a lot of money every year. The media and whoever is fingering the blame wants a piece of that pie. How much money does the boy have?...Not Millions, I can tell you for certain.
But to truly answer the person's question, it's fine to allow children to play violent video games as long as the parents do their job to teach their kids right from wrong and reality from fantasy. Parents should also learn about the ESRB Ratings System and what it means as well as knowing what you're child is playing.
Even a small amount of proper guidance in the beginning prevents a lot of havoc from occurring further down the road.