No need to wonder why. The kids might find out that it's fun.
OK.
I’ve always loved that picture.
Now for some reality.
A few years ago (2004?), a 13 year old girl was killed at the annual Knob Creek machingun shoot while firing the tri-minigun. Three miniguns, one mount and one trigger. The unit flipped over and killed her.
Sometimes, children do not understand the dangers and therefore cannot consent to the dangers.