"Evolution cannot occur unless 'favorable' genes are segregated out from amongst 'unfavorable" genetic formulae' [...] any population that adopts a perverted or dysgenic form of altruism – one which encourages a breeding community to breed disproportionately those of its members who are genetically handicapped rather than from those who are genetically favored, or which aids rival breeding populations to expand while restricting its own birthrate – is unlikely to survive into the definite future."