Honestly, I think that from both ethical and health perspectives, cow's milk is a terrible thing for humans to be consuming. And by health I mean not just that of humans, but of the cows themselves.
https://funcrunch.medium.com/dairy-white-lies-a407b8acad20
https://funcrunch.medium.com/vegan-for-their-health-not-mine-3e4ae80665ef