in reality those who were/are going to would have done with or without instruction from a book and those husbands who naturally would not are not going to whether it is written in the Quran or not?
I think not necessarily. One of my (former) friends' husband, from what little I knew of him, was not the sort of person to be easily incited to violence. However, he made the considered decision to beat his other wife, at least once that I know of but doubtless other times as well. The story, as told by my friend, goes like this:
[husband, speaking to my friend (his wife) about his other wife]
Husband: So, she did (insert mildly disrespectful behavior), and she just won't stop.
My friend: Yes, that is very disrespectful. I would never do that. She really can't continue it.
Husband: I've asked her many times, but she won't listen. I suppose I have no choice but to beat her.
My friend: I agree, you have no choice.
He proceeded to plan the beating, choosing the implement (I think he chose a belt), the location (her arm), and the number of beatings (don't remember). It was carried out in a very calculated manner.
He very clearly chose to beat her as a means of correction, and as a direct result of the Qur'anic recommendation in such a circumstance.