It was undoubtedly an overreaction to rare crime but it has continued and children's lives became even more cloistered as "stranger danger" programmes and health and safety regulations took hold in schools over subsequent decades.
Supervision of children, not letting them anything considered dangerous, usually means organising what they can do. The researchers found today's 10-12 year olds attend an average of 4.1 organised activities a week, more than twice as many as their parents. At some point this surely comes at a cost to a child's own initiative and ability to amuse themselves.
One of the speakers at a symposium in Auckland next weekend called "Rewild the Child", blames problems such as school bullying and youth suicide on children's loss of connection with nature.
Teachers in schools that let kids climb trees, explore bush, enjoy some rough and tumble report less serious fighting, fewer accidents and better classroom behaviour than they have seen in more cosseted schools.
It is food for thought. It is hard not to worry when the kids are out of sight but at least when they are in sight, parents could relax more, refuse to entertain them, watch them become curious and creative.