There is no excuse for violence. Nobody deserves to be beaten, terrorized, controlled by physical force or raped. Victims of violence eventually try to leave a destructive relationship. Violence against others is a crime. Police by law can arrest a batterer if there is probable cause and prosecution will go forward.
Abusers often lose their families and friends.
There are place to get help. Remember that your statement may be the very first warning to the abuser. Your interest might make a real difference.