littlewhitebag unfortunately that is not always the case though, social services/police in some areas can be shockingly lax.
I personally have a friend who was beaten to within an inch of her life by her ex partner, in front of her two children, he also attacked one of the children (aged 2), the case went to court, he was convicted on both attacks, and is no longer alllowed contact with his children, the judge ruled he should never have closecontact with other children either.
6 years later he is out of prison, married to and living with a woman with her own two young children and despite his ex reporting this to social services and her victim liaison team, nothing has been done to protect this woman and her kids from him.