The domestication of cats began in Asia; the Fertile Crescent to be exact; which suggests, according to the accepted theory of the peopling of the globe, that the Rh D positive factor should be more prevalent in Europe.
Your argument for a non-feline environment does however add more weight to my hypothesis that there are two distinct branches of hominids, since the evolution of Felidae preceeded the evolution of the 'modern human'.
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