whackamole - I agree
Also, I do understand that when your child is hurt by another child it is very very upsetting. And those injuries are bad - I remember it well - DS1 used to get quite routinely bitten.
But many of us who are good parents, where there is no domestic violence or any SN, do have children who bite, push etc. It's what children who want things, are impulsive, are trying to make contact without having any social skills, and are not very verbal sometimes do. It came as a great shock to me that one of mine was like this.
Yes, it should be investigated, but there is no need for hysteria