Okay, I’ll try again to better answer the question directly.
There are efforts to educate people about what warning signs to look for, signs that might indicate someone is heading towards being a mass shooter. The hope is that, when people can recognize the warning signs, they can get that individual help before they do anything irreversible. This video was put out by Sandy Hook Promise and I think conveys this concept effectively (both some of the possible signs, and the inherent difficulty in spotting them). You can visit the organization’s website (second link) to find out more about their approach, which may be closer to what you’re looking for with this question.
I think educating people about warning signs is an important piece of the puzzle, and every person that is able to get the help they need as a result of someone reaching out (whether or not they were going to be a mass shooter), is worth the effort. I don’t think, however, that this strategy is enough on its own. Similar campaigns are made for the warning signs of suicide, for example, and while it certainly means more people are helped than would have been otherwise, it’s not at all a guarantee… how people express emotional pain isn’t a formula, which means it isn’t as simple as saying “I see x, y, and z. This person is mass shooting candidate.” Not everyone will show every sign. Not everyone will show those signs in the same way. Some may be very good at hiding what signs they could have shown. And without the hindsight that allows us to trace a straight line through otherwise ambiguous signals, it’s not always clear. What I’m trying to say: this kind of education is really important, and can really help people, but it’s not a sure thing on its own.
The family that took in the Florida shooter didn’t notice anything off about him in the days before the shooting, and they lived with him.
There are also efforts in schools to provide better support for students and to meet students’ individual needs academically, socially, emotionally, etc. The trick with this is there are many variables at play, including (but not limited to) the resources/funding a school has access to. There is no across-the-board synchronized effort, and there is no simple answer to this. Things have to be researched, funded, coordinated, assessed, revised…. Of course I support schools continuing to improve their ability to help each student. But in the meantime, in the we’re-still-working-on-this phase? Seems like we’d also want to be working on a solution that can have more immediate results, a solution that makes it harder for students to commit such a devastating and irreversible action because the system failed them, or at least hadn’t yet helped them.
I also don’t think this strategy will be enough on its own, though of course the idealist in me likes to think it would be. Again, I think this is a very important thing for schools to do, and it can really help people (and not just those who were going down the path of being a mass shooter), but it’s not a sure thing for stopping mass shootings on its own.
School drills for shootings are also changing, too. I know you mentioned training/drills in the OP, but since they are apparently changing, I thought it worth bringing up. Students and teachers are still taught to run and hide, but, from what I understand, they’re also now taught that if you can’t get away from the shooter, and you have an opportunity to fight back, do so—because you’re out of other options, basically. I haven’t looked into how effective this is in practice.
Once again, I think these drills are important—the move of last resort, trying to make sure as many people are prepared and as safe as they can be in a horrible situation. But obviously, this isn’t enough on its own.
I don’t think that solutions like putting metal detectors at the entrances, or having armed police on campus, are good solutions. I think they’re cop outs. If our schools are so unsafe as to need that kind of security, we’re already doing something wrong as a society. (I also don’t think it helps foster the school’s sense of community. It’s a system that says, every day, “you can’t be trusted; your classmates can’t be trusted; you’re entering a place where you’re at risk.” Seems like if someone’s already on the edge, this wouldn’t help bring them back. And even if it does manage to keep a shooter out of the school, it’s only solving the issue of location, not necessarily of the shooting itself. Unless we’re saying we live in such a dangerous society that we need these kinds of measures in place for any type of crowded place—or, as the Vegas shooter pointed out, any place that might give a shooter a vantage point…. Etc.)
In short, there are some things that I’m aware of people doing to try and prevent tragic shootings, and that are outside the scope of gun control, and that I think are worth doing. (There are others I don’t think are real solutions). I don’t, however, think those things should replace gun control. I think they should work in coordination with reasonable gun control measures.