Unfortunately there seem to be a lot of parents who bring their children to an airfield and expect someone else to keep them in order.
Last week I saw two children climbing on the fence as their parents sat alongside. The mower was going up and down, getting ever closer to the fence. Eventually, the mower had to stop and one of the Ops staff had to come out and ask the parents to remove their kids until the mower passed.
I assume that the main job of the Ops staff is to operate the air activity safely, taking phone calls, operating the radio and providing a service to pilots. When they see children behaving unsafely, I imagine that they do not always have time for "a quiet, smiling word from the airside of that little fence." ( Although sometimes I have actually seen them do that)
If parents do not have sufficient situational awareness to keep their kid under control perhaps they shouldn't be near an airfield anyway.