The death rate for US children has surged by 25 percent over the past decade, according to a study published last month by pediatrician Dr. Christopher Forrest and colleagues in the Journal of the American Medical Association. Even as the child mortality rate has slowly fallen in other developed countries, it has surged in the US, along with every other indicator of chronic illness.
Net differences in rates =/= rates.
Over the last 30 years cars are the largest killers of kids.
I would say gun violence taking the lead is actually due to work from home reducing car traffic and therefore collisions.