Trapping is a form of vigilantism and subject to the same problems. What happens when a little kid walking with their parents runs over and picks up the box ran

Trapping is a form of vigilantism and subject to the same problems. What happens when a little kid walking with their parents runs over and picks up the box randomly, and gets show in the eye with a paintball? There is a reason we don't want a society where that kind of thing is OK.