Todd > I think the reason is that the effect of  "foreign proteins" isn't very well understood yet

The following quote is from a Medscape article called "The Consequences of Obesity and Recognition of Celiac Disease -- Two Growing Concerns Worldwide" http://www.medscape.com/viewarticle/483407_1

"Celiac disease (CD) is an immune-mediated enteropathy triggered in genetically susceptible individuals by ingestion of gluten-containing grains.... The disease is now reported to be present in 0.5% to 1% of the US population, 10 times higher than previous estimates"

This is not an undocumented, obscure topic.  15-30 million people in the United States alone have Celiac Disease.  That's somewhere between the populations of Texas and California.  And since Celiac is subset of the larger condition of gluten sensitivity, the actual numbers of those affected by gluten are much, much larger.  To say nothing of casein.  Cordain and Rosedale should mention it.
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