Why do cultural moral norms exist?

[mriana]

@morgankane01

Vegetarianism can be a moral norm, a cultural one. It can be enforced by law or by custom, even in societies where it is not necessary to solve cooperation problems.

Hindus are a good example and most (not all) are in India. Some in India are Muslims, but the vast majority in certain areas of India are Hindu. Most are vegetarians, especially the Jains, a sub-sect of Hinduism.