Was the cause of this massacre video-games? Well, no.

Gather Information: 
During my analysis of this video, I found other articles that went further in-depth, where one provided a police report on the search of his home, and due to games being physical copies at the time, even on the platform of steam; the report found no games, not even the claim of Counterstrike, being there.  Now, this is a smaller case, so I've went further and went to what would normally be an untrustworthy source, a mommy-blog, where even there they presented rather sound evidence to say that this type of behavior is the cause of other issues within and outside of the home, possibly bullying from either source instead of video games.

What was said in the video, and its headline, was that the game Counterstrike was the cause for the shooting in 2007, and both the 'expert' and the host strengthen the narrative of games cause violence that escalates to the murder of others, but this couldn't be further from the truth.

Evaluate Evidence:
As stated, the police report of the incident found no games in his home where the police inspected, gaining entry to anything that might have had it. But even then, could the individual have deleted the game? Sure, but even if he had done such, the logs of something with that name or game ID number would have been detected by a simple search into the meta data, which back then

Recognize Assumptions, Emotions, Biases:  
Within the media, past and present, the aspect of games depicting violence is rampant less now than it was back before 2010s as it was the newest fad that the older generation did not want to adopt due to the habit of avoiding physical activities. This was a valid reason, but in the purpose of the news cast, the yellow-journalism that took place to demonize the games and play into the fears of the public is unmistakable, even through the police report was available at the time of the newscast, and even if it was, I found no evidence to support the news network went back on their word.

Synthesize Evidence, Identify Alternatives:
Alternative Solution 1: Videogames cause violence in younger minds that are subjected to them, mostly to those below the age of 19, with sources being the larger media corporations and politicians using it as a puppet to give meaning for heinous crimes.
Alternative Solution 2: Videogames do not cause violence, and it is instead the result of bad parenting to not notice the signs in their child and catch it before something bad happens, being complacent to let their local school system notice it first before they act. This is supported by numerous studies that have explored the child and teen psyche and the influence from videogames, of which the findings found that although there is a rise in adrenaline and competitive tendencies, there is also the presence in anger due to frustration in the individual's ability to play, but never to the extent that the child becomes psychotic 

Select Best Alternative:
I have concluded that videogames, despite the larger media's viewpoint, do not cause the levels of aggression they claim they do, as although there may be some, it does not elevate to the point of the need to harm others, and as such the best ways to do it is to moderate a child's time playing to give them a sense of a reasonable time to play the games they enjoy.