1. Moral superiority. Most vegans are upper class. They may have chosen to stop milk, but their overall carbon footprint would be far far higher than any simple villager who has meat. Each of us is free to drop what we want without claiming high ground The urban vegans (in most cases) would do well to give up cars first before preaching veganism to the 'masses'.
2. A reductionist nutritional wisdom claiming to know better than traditional wisdom. My village people believe milk is good for children, and want to give them milk if they can. Ayurveda also says milk is good. To come up with new fangled theories based on some lab tests and experiments to dismiss them and their understanding is typical western intrusion into traditional wisdom. I have said in the above comments that I have addressed my village children’s malnutrition with dals, and then with milk, and the difference in effect is vast. That peice of experiential detail is ignored in the thread.
3. The ethics of modern diarying I am in agreement with. That is the ethics of modern industrial processes and modern living. Which needs to be corrected on every front, including this.
But to say that we should stop milk for the sake of cows is infantile. If milk ceased to be bought my village people would have to abandon the cows because modern industrial living has reduced the economy to cattle to just this. There are no prehistoric pristine forests where the cows can roam free and graze. From the point of view of cows ethical diarying and cattle based agriculture needs to be recreated.
If you take Gujarat/Rajasthan breeds, they yield quite a lot and that's why you see heavy usage of milk, butter, ghee, curds there and lesser or zero need for meat.