Kids playing video games and getting very angry at other players online, is going to happen. Is there something that can be done at this level?
I remember hearing things back in my high-school COD days. Kids are brutal, and terrible at coping with their emotions. Saying things like "I'll stab you! You ....", at the drop of a hat. I always wrote off these types of threats as a form of venting. But then again, I never shared any personal information with people online. So I wasn't worried.
Swatting... This has been going on for quite some time now. Maybe we can start here? Train responders to be aware of these potential scenarios - that the whole thing _could be_ BS, and you should approach the situation open-mindedly, rather than expecting a battle. De-escalation training, etc. Why are police not showing up and assessing the situation first hand these days? Before taking a 911 caller's word as gospel. Assess the situation, on-site.
Giving some kid more prison time will not dissuade others. There's a lot of research done to show that negative reinforcement like this doesn't work.