I'd explain it as "Their minds aren't rational enough to explain to their kids why what they did wrong."
Learning never ends.
I heard old guys say, “My father hit me and it didn’t harm me” and didn’t know how to answer.
Then I heard someone tell an old guy, “You just told me the harm it did.”
The old guy’s not knowing his father harmed him was the harm it did.
“…and when I spank them… the result is that they learn to obey… And obviously that’s the goal. What we’re doing is we’re raising adults who will learn to obey their boss at work, learn to obey their pastor in a church, learn to obey their husband at home.”
Someday we will look back at this quote and wonder how we could have been so primitive, and how could we have allowed children to be brought up in such an abusive environment, where the end goal is unquestioning obedience.
“It has always seemed absurd to suppose that a god would choose for his companions, during all eternity, the dear souls whose highest and only ambition is to obey.”
Robert Green Ingersoll, “Individuality” 1873