There are millions of situations as I think most people act and stand up for a child. Obvious situations when a child gets bad but also in situations where we are doubtful - it is about children so we act anyway.
Then there are all those moments we have been at a playground with our own children and quietly wondered why any parent completely ignores his own child; The child who seems to have taken over the playground at the moment. Sometimes we adults may think (or no - feel!) Irrational in the heat of the moment (especially if our own child has been saddened by this child's actions) and silent or high out our feelings. (In some situations, it will of course be necessary to act).
With the way of thinking "All children are everyone's children" we have a responsibility. But parenting is sacred and there are probably a thousand ways to trample errors. That what we say lands wrong.
My thought is if we should practice more on this. If our own inconvenience to the confrontation with another parent is not always so healthy. (And of course I do not mean that we should rush to people for everything and nothing but in those situations when the gut actually says "no": dare to talk).
Severe subtle balancing acts where we often act a little arbitrarily based on our own location. How are you thinking?