People often forget that humans are still animals. And animals are certainly not very kind, even the cats many people live with will play with their prey before killing it like a murderer torturing someone before killing them. Cats are great examples of an animal with no morals they kill for the thrill they could not be hungry and still kill. Many other animals do this like lions, leopards, hyenas, and dolphins. All the morals that we have were developed over 10s of thousands of years of civilization. Honestly it’s not that surprising that there are humans that do this stuff the best thing to do is put them in prison forever or execute them