The article describes the child was already engaging in dangerous behaviour (climbing the roof) and pushing boundaries. By giving errands you are (gradually) se

The article describes the child was already engaging in dangerous behaviour (climbing the roof) and pushing boundaries. By giving errands you are (gradually) setting new boundaries for the child you have at least some control over, instead of them suddenly discovering they can go into the neighbourhood or wherever that you don't know about. At least that is what I understand from it. The alternative would be more/stricter boundaries I think. But that would just lead to more undesired and dangerous behaviour from the child to break those boundaries.