A cynical view is that because we've protected our children so well from other forms of harm (safer motor vehicles, lower risk of certain cancers), while gun violence has stayed relatively even over the last decade. This is not only not true, but it ignores the fact that this is the one area where we've FAILED to keep our children safe.

Millions of students have participated in school lockdown drills (or active-shooter drills). There's no standardized definition of those terms, so it's hard to even talk about their efficacy. Some are shelter-in-place drills, some involve an actor portraying an intruder trying to hurt or kill students and children.

Much like duck-and-cover drills during the Cold War, the efficacy of active shooter drills is unproven at best, and harmful and traumatic to a generation of kids, at worst.
source: https://thehill.com/homenews/education/3983963-active-shooter-drills-may-be-traumatizing-millions-of-students/

There's universal consensus that our current system is not working. The competing historical narrative, influence of the monied interests, and fearmongering has led to a complete lack of regulation, safeguards, and checks on access to guns among criminals and bad-actors who should not be in possession of them.