If u did wrong you get birth or an animal? so whats wrong with that? animals got soul as well, feelings and inteligence. An animal can be as happy as a human, many animals are happier tan many humans. They don´t kill if they don´t have to, they kill in order to survive, not like many humans that can kill just for interests, and torture psychologically and fisically.
They are adapted to live in nature. Nowadays We need to modify nature in order to survive in it
I wonder what would happen if there was that third world war that is being talked about so much. How many of us would survive. How many animals would do it?