People (women and men, both with their own methods) are the root of the problem.
Remember: tech is never the issue. People are.
People killed other people long before guns were a thing
The deadliest school attack in US history was the Bath bombing, which did involve a gun, but most victims were not from it.
The common factor is mental health, not firearms.
The common factor is easy access to firearms. Every country has mentally ill people, every country has embittered people who are mad at the world, but only the United States has removed the restrictions on gun access which allow those people to engage in mass shootings. That started in the late 1970s and the contrast with our peers is staggering: Australia has many cultural similarities but they actually value life and tightened their gun control laws after the Port Arthur shooting, while we’ve loosened ours and have hundreds of thousands of more deaths.
A well-known example is Swisserland, where lots of people have guns but somehow do not use them to kill people.
Another well-known example is France, where people use knives to cut other people's heads.
And are you actually comparing a trained militia to randos buying military hardware without any accountability or oversight? Because generative AI isn't only accessible to trained and licensed practitioners, is it?
The US is not a good representation of the world.
"Trained militia", you mean every random citizens and its family (the guns are kept are home) ? Then yes, this is it
https://en.wikipedia.org/wiki/List_of_school_shootings_in_th...
At what point did ordinary people get easy access to weapons that have high capacity and rapid fire? That's when we see a rise in mass shootings. Today, ordinary people are getting access to tools which can quickly and easily make better fakes than experts with photoshop could do even 5 years ago.
Fix't that for you. Anything is a weapon. The resulting high score is merely a matter of practice. No exceptions.