The third horn for cases 4-6 is to remove the husband's biological chauvanism. Whether the child is biologically related to him shouldn't matter.
Why on earth should this not matter? It's very important to most people. And in those scenarios, there are the additional issues that she lied to him about the relationship and the kid and cheated on him. It's not solely about parentage: for instance, many people are ok with adopting, but not as many are ok with raising a kid that was the result of cheating.
I believe that, given time, I could convince a rational father that whatever love or responsibility he owes his child should not depend on where that child actually came from. Feel free to be skeptical until I've tried it.
The title says it all.