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Idk what you can do
There’s a few ways of affecting (or more correctly, effecting, I think?) cultural change. The principal causes and main actors are already identified. Suing them into the ground and campaigning against anyone who supports them is a start, but comes with consequences most people are understandably afraid to face: financial hardship, social isolation, legitimate security concerns about gun-toting wackos.
Hollywood and the music industry are complicit with the gun industry in equating guns with play things rather than ultra-specific tools, and in reframing shooting a person as a footnote rather than a pivotal moment in a character’s life. They occasionally pay lip service to the victims of violence but you don’t see A listers putting their money where their mouth is and refusing roles.
The demilitarisation of the police post-9/11 is something that will require a much greater effort.
There is such a strong cultural connection with these ideas that Idk what you can do.
It's that idea of being a real life John McClane. Even Die Hard calls back to Westerns. That image is leveraged by the entertainment and weapons industry and round you go.