How many people play video games and how often do you get mass shootings. There's just no link.
Look in the video how the hostess is trying to practically IMPOSE to a psychologist that games are THE ULTIMATE cause for mass violence. Seriously, holy shit.
Just because you get some whackos once in a while and they played video games, that doesn't mean THAT made them do it WTF. They should take some Statistics classes.
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The only thing that I could reasonably believe is that desensitization makes one forget just how powerful and painful misuse of certain items are. I don't believe that games create a desire for violence itself.