They think raw milk is natural, but would they still feel that way if they knew how selectively bred all dairy cows are at this point? The DNA of the dairy cow is where the milk manufacturing pipeline begins. We didn't select for sanitary milk from the udder because we knew it could be pasturized later in the pipeline.
These people fundamentally don't understand nature. We had cows for 8,000 years or so, we existed at least x200 that. So it's 0.5% of our existance which means it's a relatively new technology. Even if you appeal to naturalism here it makes absolute no sense.