As a child I witnessed mental, physical, and emotional abuse by my father to my mother. For as long as I can remember remembering, he beat her. In public, at home, at relatives, often for no reason or a reason known only to him. Bloody beat her, for many years...until I was 10 and my mother moved us away. I remember the police were there while we threw our stuff in a truck, they tied my dad to a kitchen chair in the middle of the yard and he cried. He said he only wanted to kiss us good-bye. I tell you all this because it is possible for a man to abuse a woman and not abuse the children, my father never laid a hand on me or any of my siblings. I am sorry that it was not true in your situation growing up. I feel that the reasons that a man is abusive is to a woman are all unique and of course 100% wrong.
Crystal may have thought that RC would not abuse the children and that is why she never sought custody, we can agree on that. But, the thing is, if RC was so abusive to her then why not fight for sole custody of her children? Are you of the opinion that she continued to fear him even after she was gone and had a new friend/boyfriend in her life? Crystal seems like a strong enough woman to me now.