From this comedic article about the pointless activities of those without purpose in their lives.
Mix up enough European ethnic groups, different castes, and trace admixture of other races and you get this type of genetic outcome: round face, neotenic features, and large ears.
Traditionalists believe that the Cro-Magnid type was the original form of humanity, and everything else represents deleterious mutations now mixed into the original. Maybe, maybe not, but clearly something goes wrong with mixing.
Many in America also exhibit other forms of bad breeding, including the tendency to incorporate deleterious mutations through inbreeding and social systems which reward the easily tractable.