An abuser isn't abusive 24/7. They usually demonstrate positive character traits most of the time. That's what makes the abuse so confusing when it happens, and what makes leaving so much more difficult. I know women, personally, who are physically and emotionally abused by their husbands, yet they stay and sometimes believe they are in love. I believe this is one of the reasons why this issue is still going. Abusive men will never stop abusing until women start to know their worth.
The biggest challenge is to convince a woman that it's not her fault. If your husband is abusive, you cannot ignore it. There's no excuse for a man hitting a woman. Ever. Self respect by definition is a confidence and pride in feeling that you are behaving in an honorable and dignified manner. Respect yourself and walk away.
Violence against women is the last refuge of disgusting immoral men. He who has once hit a woman, had forever killed a man in himself. Every time you mistreat a woman, you give up the right to be treated like a man.