It's not easy to prey on your own kind first. Secondly, you can imagine two populations of the same animal, two opposite gene populations A. Gene A: There is no difference in diet between the same animal and other animals. Population B: Only when food is extremely scarce will they eat the same kind of meat. When other animals are short of meat, population A will decrease sharply because of cannibalism, and the relative population B will decrease even less. After repeated elimination, gene B will gradually replace gene A, and then this carnivore hardly carries gene A, which is mainly manifested as gene B.

Humans and other carnivores need protein, and protein is one of the important nutrients. Human beings are the closest to human beings and can be said to be one of the good sources of protein. However, after thousands of years of development, human society has gradually taken shape, and the sources of protein are various. There are eggs, some grains, many domestic poultry and animals, some insects and so on. Compared with the huge warehouse of life in protein, human existence is insignificant.