I think it will depend on the ages (and maturity levels) of the kids, and the quality of instruction.
When I was 7 and 8, my parents sent me to summer camp. We had archery (target arrows and simple reflex bows), and marksmanship (BB guns, probably Red Ryders). Nobody lost an eye.
My then-12 year old cousin did quite well at his youth hunter's safety course in Florida. So did the other kids. (My cousin had the best written and shooting scores - safety and accuracy. Made me pretty happy, as I had taught him prior to the course.)
OTOH, there was that gun show in Springfield MA a couple years ago where some idiot (Chief of Police, IIRC) left a poorly qualified teenager in charge of his booth, and the teenager and a small boy's father decided to let the small boy shoot an Uzi full auto pistol. Kid panicked under recoil, and rode the trigger all the way as the Uzi rose up under his head. Killed him. Big lawsuits.
So, it depends in part on the kids, and it depends in part on the quality of instruction (program, planning, and instructors).