Myzen,
Abusers will never change their behavior unless they want to. It is impossible to have an abuser stop abusing by forcing them to go to classes and therapy. They have to want to stop hitting their partners and that is a hard thing to do. People abuse to gain power and control over a situation. It is easier to get one's way in a matter when physical violence or emotional abuse is used. They have to want to learn how to communicate instead.
Programs to rehabiltate abusers have a very low sucess rate (regardless of what they say). Most programs tally their "success stories" by seeing how many men hit while in therapy. The rate is almost zero because if they are caught they go to jail (it is usually the choice of therapy or jail when someone is arrested for D.V) so of course they have a good success rate.
It is not anyone's reponsibility to change or "save" their partner because it just does not work.
Jessica