renaissance poisson

I think there are at least two relevant differences.

Firstly, children have a strong emotional dependence on their parents which is a normal part of healthy childhood development. Because of that, removing the child from the care of the parents - even abusive parents - is likely to cause adverse psychological consequences which have to be weighed against the psychological and physical benefits of ensuring the abuse does not recur. An emotional dependence of the same strength between domestic partners does sometimes happen, but it is not healthy, and might indeed even be an additional reason for recommending that the woman leave.

Secondly, the contrast between the words "removing" and "recommending" in that paragraph is significant. Barring conduct on her partner's part which is so extreme as to result in imprisonment, a woman has a choice about whether or not to leave her partner, and the act of exercising that choice can be therapeutic in itself. Children in most cases have no such choice, and the trauma of being taken from their family against their will can exacerbate the harm caused by the abuse.