Can I be brave and say is it just possible you and others being a little bit sensitive? Trailling around your kid seeing every slight. The drawing blood thing is horrid, agreed, but on the whole in my experience - kids do this irrationally from time to time , kids that get it done to them (including mine) soon recover, most parents step in, certainly if they see it (they don't always admittedly), The local playgrounds and Peckham Soft play are really, really not crammed with viscious unpleasant out of control kids.