I submit there is no right and wrong in the world without religious context involved
Science and Darwinism will lead a person without religion to understand its survival of the fittest, strong survive and higher intelligence animals do what is best for themselves. Maternal instincts matter as well as other factors but
https://en.wikipedia.org/wiki/Infanticide_in_carnivores
Many primates practice infanticide including chimpanzees, gorillas, baboons and langurs while others do not, including orangutans, bonobos and mouse lemurs.
Without God / religion ... we are nothing more than animals and because of that, nothing binds us. We are each enabled to do the worst things imaginable aren't we ?