I have a theory, that women who were abused as children, accept abuse of their own children, as a "normalized" part of life. They are not horrified, because it seems "normal" to them. They tend to ignore it, because it brings up their own PTSD, so they compartmentalize it, and act like everything is fine. Or they may even participate in the abuse, as it is "normalized" as "okay". Just a personal theory on why some people allow their children to be abused.