The real reason we drink cow’s milk is due to goverment endorsed media propaganda.
Cow's milk is NOT essential for human health. Humans are able to get all the required nutrients from a high-quality diet free of dairy.

Most adult humans around the world are lactose-intolerant, meaning that, once they were weaned from breast milk, they gradually lost the ability to consume animal milk and certain other dairy products without having digestive problems.

No human should be consuming milk after they’ve been weaned from their mother’s breast; it is completely unnatural. Cow’s milk is intended only for baby cows—and it’s cruel to take the milk away from the calves for whom it is clearly intended. Need calcium? Milk, which may contribute to osteoporosis and numerous other health issues, is the last place you should be getting it.