It’s a wrong focus. While “disease prevention” is something that each of us can do as individuals to avoid contracting or spreading illness, and vaccinations and other public health issues are common to all, “violence prevention” (except that each of us can certainly tend his own garden and maintain – as much as possible – his own mental health) is pretty much outside of our scope as individuals. And the only way for government to “prevent violence” is to be exceptionally violent in modifying society in ways that would paradoxically probably make us more prone to violence. (I am never so generally outraged as when I pass through the various “security systems” maintained by the state: TSA at airports and other transportation hubs, courthouse security scans and other areas where crowd control and access is “controlled”.)
The answer to the problem is NOT going to be “to increase security forces applied”. That is, to take the failed route that the UK has been taking for decades to limit more and more access to weapons (which, generally speaking, level the playing field for those who need additional protection), to add “security cameras” on every hundred meters of paved roadway, and to limit speech to the extreme and ridiculous extents that they have. UK society may have fewer “gun murders” than we do, but in general their society is far more violent than ours.
It would be helpful, I think, if we admit that fatherlessness is a major contributing factor to the outbreaks of mass violence that frequently plague us – but it’s not politically correct to admit that family breakdown, single-mother families and other family structures that exclude fathers are problems. After all, it’s been recognized for years, but no one seems willing to admit it. Instead we blather on about nonsensical issues such as “toxic masculinity” without considering where that might come from (if it really is a thing).
It would also help – greatly – if we permitted and encouraged more “actual play” in young children, and especially boys. These days “outdoor play activities” are so rigorously structured, controlled, managed and circumscribed (when they happen at all) that boys hardly ever seem to just run around any more, to burn off their excess energy, to test themselves in safe ways against boys their own age and to learn their limits – and about pain, too.
So, yes, there are things we can do that might help to address the problem, but… the problem you see is not “the problem”; it’s just one of many symptoms. And as long as all we do is address symptoms, the problems will get worse.