It helps, but this could be solved with increased affection for your children specifically, so I don’t think it’s the actual motivation for the trait.
The core is probably several things, but note that this bias is also part of a larger package of traits that makes someone less disagreeable. I’m guessing that the same selection effects that made men more disagreeable than women are also probably partly responsible for this gender difference.
Moral intuitions are odd. The current government’s gutting of the AI safety summit is upsetting, but somehow less upsetting to my hindbrain than its order to drop the corruption charges against a mayor. I guess the AI safety thing is worse in practice but less shocking in terms of abstract conduct violations.