@hancea1996 regardless of whether you can apply human standard morals to non-human beings, my points before that still stand. Parents are absolute garbage, and for the sake of an innocent child's life and safety, it's better to have the two absolute degenerates dead. Unless you believe that every life is worth equal, regardless of what kind of person they are. If that's the case, it's better to save 2 murderer's lives over an innocent person's life if you had a choice. And if that's the route you want to take with your philosophy of morality, then I don't see any point in even attempting to further debate on this subject matter. And beyond that, what would be real fucked up is if the yokai just left the kid abandoned with no guardians after killing the parents, but the yokai took in the child and is actually caring for him in the most loving fashion a good parent would. In a argument for what's the better choice, I'd say what happened in this manga is better by miles and miles, than if the kid was left with the two shithead parents. Sure, you can make the argument that the yokai didn't have to kill them and could have just taken the child away, but in my opinion I'd rather tie up loose ends and make sure they can't do the same to anyone else. What if they had another kid, and they decide to do the same thing again? The best thing would be to have the two parents arrested and imprisoned, but a yokai cannot make that happen. The next best thing a yokai could do is permanently make sure that it will never happen again. Of course, I think the yokai did it out of anger more than anything else. But that's beside the point, because for a yokai, they don't need any justification because killing humans/causing deaths is a natural thing for a LOT of yokais. And this point leads into my second point below.
I still believe it's foolish to apply human's standard of morality to anything other than human. Human standard of morality should only be applied to humans, it's unfair to apply that same morality to any species/being outside of human. Cats kill for fun, and while we as humans think badly of it, it's natural for a cat and it's just doing what is ingrained in its nature. We cannot apply our human morality on that. So I'd say it's the same for supernatural beings like yokais as well, we can't apply our morality to them and say that what they're doing is "wrong." It may seem wrong to people, but what if there's nothing wrong within their own society and it's completely normal? Of course, all of this is hypothetical talk because I don't believe any in things like yokais, monsters, ghosts, or the likes to exist, but at least within the frame of this manga it doesn't make any sense to apply human logic to a yokai.