Hey, sorry for the delay, I missed your notification.

You're right, you conflated desensitisation to violence with real world violence in your first comment and I carelessly did the same thing in my reply. The claim I wanted you to justify is that video games make kids see war as normal or armed conflict instead of diplomacy as normal. Not that there's a decrease in brain activation in some parts of the brain when watching violent media.

Violence in movies, violent sports like MMA and boxing, these have been desensitising us to violence for decades. I read a paper a few years ago that went into detail about how doctors and surgeons become almost completely desensitised to things like cutting open a patient whereas an ordinary person would barely be able to bring themselves to do the same thing. Even something seemingly minor like inserting a needle into a patient's arm is hard for most people, but doctors and nurses can do it without batting an eyelid. Working in these fields necessitates the ability to cause people pain.

But I don't think the medical profession is producing people who think war is normal or who can't tell the difference between cutting somebody open to save their lives and doing so for the fun of it. A decreased amygdala response doesn't mean people can't tell the difference between a game and reality. This is the link I don't think you've shown; the inability to differentiate between game violence and real violence. And you haven't explained why you think video games are the key factor instead of all of these other influences.

You mentioned that you responded emotionally at the beginning, and that the violence in video games sounds scary to you. I'm not sure why you find this topic particularly emotional, but again, if you're concerned about the normalisation of violence in our society, which Is a very reasonable thing to be concerned about, I think there are many places to be looking before video games.