Man is not made to drink cow's milk. Cow's milk irritates the human bowel, and our bodies have learned over time (evolved) to digest it. You will find a proportion of society allergic or unable to tolerate milk, and this is because the human body tries to revert back to its natural state so that it can digest the many other foods that are essential to our well-being.
This debate need not take place - like they did with plastic, big business has made us believe that cow's milk is good for us. It isn't. It's good for the processor. It's also good for other big business - big pharma (who will sell you lactase when you become intolerant), and big oil (who will sell you the plastic in which it is stored).
N-E-way,... as Ken Matiba used to say, "let the people decide!"