History records instances where human inbreeding was an accepted way of life. We have spoken of the Greeks but probably the most famous example was one of religious law. The Spartans no longer expose their infants to natures violence so that only the fittest survive. Among humans today every effort of medical science is directed toward saving lives. Saving all lives, the congenital cripples, the mentally defective, the deviate.
Genetic laws apply equally to man and beast.
Moral codes which change with the ages, apply solely to man, enforcing them elsewhere is not only wasted motion but downright stupidity. From this litter one selects the little bitch most like her sire. It is increased homozygosity . All of the good, as well as any harm, which results from this procedure, is due to this fact and this fact alone. Homozygous recessives, rr, show themselves and thus provide inbreedings second great gift, for no defect can remain hidden under the glaring light of inbreeding.