The Christchurch shooter was an australian (to our eternal shame). But he shot up a school in New Zealand instead of in australia because it was easier to buy guns in NZ. (Was easier. They pushed through stricter gun controls after that incident).
I hang out with fewer gun owners than many but I am from Tennessee. It is kind of like getting people to recognize the need to do something about climate change. Most everyone recognizes it as a problem now, but solutions are someone else's business. "The ability to affect the problem is upstream, what am I going to do about it? What am I supposed to do about schools, sell my gun and be without it when something crazy happens?" That is even before addressing that they can be fun, like a collectible or a sport.
The ideas tossed around are often regulations at the consumer level, and the societal momentum is thoroughly against those in general.
If an uncharacteristic law was introduced along the lines of, "no more new guns" then some in my area would begin manufacturing themselves. I already see cardboard signs advertising squirrel rifles.
Climate change might be exactly the right metaphor. Despite widespread public support for action, the australian federal government is still doing very little about the problem. Its not a good look.
Here in Australia we play all the same video games as American kids do, and we don’t have school shootings. The problem isn’t the video games.