globe have been nourished with the milk of ruminants. Joel Salatin gives a nice explanation of their conversion of plants that humans could not survive on into meat and milk. I think it's the Bantu traditional diet that primarily eat/drink blood and milk, and many traditional diets culture milk for best digestibility or drink it raw.
I think you are narrowly culture-bound and hung up on an abstract notion rather than the evidence of evolution and overwhelming evidence of history since animals were domesticated.
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