There's no doubt guns are dangerous to untrained children. The same is true for many other household tools like kitchen knives and toaster ovens. Actually, let me correct my first sentence. Guns are dangerous to untrained people who don't have self control, no matter their age.
Also, while every preventable injury is tragic, especially fatal injuries, guns get a disproportionate amount of attention because of political agendas. The reality is, for children less than 1 year of age, two–thirds of injury deaths were due to suffocation. Drowning is the leading cause injury death for those 1 to 4 years of age, but there isn't a Soros-funded movement to ban private ownership of swimming pools and bathtubs. Somehow, rational thought rears its head, and people understand that education is more effective than legislation.
Between 5 and 19 years of age, most injury deaths come from being an occupant in a motor vehicle traffic crash. Should we teach K-12 students to fear being passengers in the family automobile or the school bus?