Also, the anti-milk movement is, as usual, economically-motivated and primarily targets ignorant liberal types and paranoid reactionaries.

Here's just a sample from a serious source: Park, Y. W., Haenlein, G. F., & Ag, D. S. (2013). Milk and Dairy Products in Human Nutrition. Wiley-Blackwell.

Section 5.4 describes the possibility of certain cow genotypes producing milk that, through an allergen byproduct BCM-7, could contribute significantly to the onset of diabetes and cardiovascular diseases, but the research is mixed and milk from most genotypes is not associated with such risks, though at least in the EU one of the dominant genotypes is the A1 genotype associated with BCM-7 byproducts. But milk contains many useful proteins ("biopeptides", e.g. casein-related compounds) that are inactive in raw milk but may be released and activated during industrial processing or in the gastrointestinal tract (opposite to some of the claims in the anti-milk movement).

Once absorbed, casein peptides have the potential to exert numerous biological effects in the human, i.e. they may play a crucial role in the transport and absorption of certain minerals, bind toxins, mediate immunomodulatory effects and behave as opioid receptor agonists or antagonists (Phelan et al ., 2009). Because of their biological activity, serious interest has also been raised regarding whey proteins that exhibit a diverse array of non-specific activities, i.e. anti-inflammatory, bacteriostatic, antioxidant, opioid and anticancer properties (Chatterton et al ., 2006; Pan et al ., 2006).