They're actually fine with children dying because it means they get to go to heaven early, plus the adversity it causes their loved ones is beneficial. I'm serious, they told me this when I asked as a kid.
Better question is why wouldn't parents immediately sacrifice their newborns on the Blood Altar? I can only go to hell once but I could sire many children and give them all a guaranteed ticket to heaven. Actually, I could even take a shortcut and blow up a maternity.
... now that I think abkjt it, I guess some fundamentalist lunatics have probably already done it, and now I'm sad.
Not that was a good thing. she cared because Zeus would come down as an animal and rape hot humans, so she cared an awful lot about people. So she could torture them.