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There was multiple videos on youtube about the question; "do video games cause violence in children?" Most were from high-profile youtubers instead of the television companies. Many of these youtubers posted videos of violent games.

PBS News hour documentary contained interviews with: game review editor, public health experts, teenage students, the founder of common sense media and journalists.

From the documentaries we heard multiple opinions for both sides of the argument.

Despite children learning the most at a young age, they will not understand the violence till a much later age.
The affect on children is household dependent rather than the game, meaning parental control will play a part in it.
Both the designers and consumers share responsibility. Designers because they know the game that they are producing is bound to have some sort of impact.

Video games aren't the definitive reason for the violence- all results are correlational, which doesn't show the cause.
Believed that it isn't the violence within the game that causes the real world violence, it is the competition against the computer and real people online that causes it.

Report from the US Secret Service and Department of Education concluded more than half of attackers demonstrated interest in violent media. However the report cautioned no particular behaviour, including having an interest in violent media, could be used to produce a "profile" of a likely shooter. Gun crime and youth crime- both down in the past 20 years, despite an increase in violent video games.

A study in 2013 showed that violent games such as Mortal Kombat, Halo and Grand theft auto did not cause high risk teens to become aggressive bullies or delinquents. (High risk= person has symptoms of depression or attention deficit disorder)
Researchers found that video games had a camping effect on teens with symptoms of attention deficit disorder. More unusual if a shooter did not play a violent video game, given that the majority of youth and young men play such games occasionally.
(http://psychcentral.com/news/2013/08/27/in-new-study-video-games-not-tied-to-violence-in-high-risk-youth/58934.html)

Playing violent video games can make some adolescents more hostile, particularly who are less agreeable, less conscientious and easily angered. But for others, it may offer opportunities to learn new skills and improve social networking. Video games in mental health care settings
may help young patients become more cooperative and enthusiastic about psychotherapy.

“These results suggest that it is the simultaneous combination of these personality traits which yield a more powerful predictor of violent video games,” said Markey. “Those who are negatively affected have pre-existing dispositions, which make them susceptible to such violent media.”

“Violent video games are like peanut butter,” said Ferguson. “They are harmless for the vast majority of kids but are harmful to a small minority with pre-existing personality or mental health problems.”
(http://www.apa.org/news/press/releases/2010/06/violent-video-games.aspx)