You did the right thing by calling the police. here in the USA domestic violence is considered a crime no matter which family member or live in the house person that is violent and takes their anger out on another pserson. I myself had to call the police on my child many times. He is now going through a residential treatment program that is trying to teach him appropiate ways to handle his anger and while being in care he has been diagnosed with having a mental disorder in which may be part of why he acts out the way he does.

hang in there. If your son is not 18 you can enforce his having to be in therapy. in fact you keep calling the police he will be court mandated into therapy and or anger management groups and classes so the fact that you are calling the police will eventually lead to him getting the help that he needs. stick with it and do the right thing. no one deserves for any reason to be assaulted be it family members or not.