Disagree. I don't think that violent videogames have the capability to make someone drastically change their behaviour that way. Nearly 100% of the cases where someone "becomes violent" because of a videogame is either someone becoming frustrated and/or stressed at a videogame (can relate), but even then it's mostly just a temporary thing and doesn't have any major effects on your personality, or someone that becomes actually violent from a videogame, but that case specifically doesn't just happen like "someone played GTA or something and became a violent person", normally the person themselves were already in a bad place and we're starting to become more mentally disturbed/going in the path of violence, and the videogame was merely the trigger that made them snap and become crazy. But even so, I believe that, if it wasn't the videogame, something else would've made them snap.
Conclusions (as in conclusions in a text like a story, article, script, etc.) are hard to do.