Actually, minimus, many abused people believe that. That is why they stay. If they are a better Christian, then the other person will change. The WTS trots out the experience of the sister that was beaten by her husband for 20 years, and finally the light dawns, he goes to all the meetings, studies, and becomes a JW.
The elders thought I must be teenage rebellion. They never listened and would cut me off mid-sentence, telling me that I needed to be a more obedient child then my father would see "the truth."
Years later, one of these elders actually met my father and spent a social evening with him. My dad was in true abusive form with his second family. This brother saw first hand the treatment we had received. He apologized to me and my siblings from the first family and worked hard to help the second family.
Elders are not trained to handle such things. Getting together with 600 other elders and seeing some reenactments on the platform for 30 minutes max does not equip anybody to handle abuse.
Thank goodness I saw it was crap after only 2 attempts at being the "good Christian."