"Why don't (other?) animals call this 'wrong'?"
Other animals eat their offspring / parents / mates. we might see it as wrong, for them it's OK because it's the 'done thing'. Following that line of reasoning, an animal (including humans) behaving like an animal cannot be morally judged.
The way I see it, human morality is a social contract. There are some things that are not done / taboo because that leads to a more harmoniously functioning society. That's why amoral/immoral people tend to be either people who feel they have been screwed over by society, or sociopaths
Biting the hand that feeds IT
