My DD is 2 but has recently suffered a spate of being attacked by other children in playgrounds - typically little boys coming up to her and punching her in the face, kicking her in the shins or something similar. So there she is, crying her eyes out, and seeking my protection when owner parent of hooligan child comes up with child (usually child sporting evil and totally unremorseful grin) saying, rather weakly 'now come on, you must say sorry to the little girl'. (for godsake, at least say it like you mean it?!)
Meanwhile, my daughter has to face this little shit again, and I feel like serving some of that rough justice to this child I would have been served when younger, while also being fearful of raising my voice in case it comes back on me