Wedrifid never said dashing babies against rocks was "wrong in the cosmic eyes of the universe". I suspect s/he values a culture that doesn't do that. That would be his or her personal value / preference.

That seems like a likely assumption. For a start it is terribly unhygenic. All brains, blood and gore left around the place. Lots of crows picking at little bits of baby. Flies and maggots. Ants. A recipe for spreading plague.