It goes to show what a selfish and messed up freak this guy is. It's already a disgusting crime that he's taking advantage of Wakaba and manipulating her, but the fact that he can look at a baby, acknowledge to himself that it's his child, and still want to kill it just steps it up to another level of depravity. I don't think he even views people as people, he just sees them as things. In Haru's case, he's being looked at like damaging evidence that needs to disposed of as quickly as possible and nothing else.