See, you can do everything about it, but some children when they get angry they like you know bang the bench or write something on the bench or scratch it so its no very hard.Do non-violence or ahimsa ,ask them not to do it first politely then they may hit you ..... .but the next day bring some paint and paint the place where he\she scratched. keep doing like that,then one he\she will stop doing that. I guarantee you that he \she will stop