“As it had been explained to David long ago, genetic diversity was very, very important. The more diverse the human gene pool was, the better were humanity’s chances of adapting to any new and unexpected conditions it might encounter, now that it was beginning to push outward into Space, to say nothing of surviving any unexpected natural disasters such as polar shifts or meteor strikes on Earth.
Unfortunately, humanity had been both unlucky and foolish. Out of the dozens of races that had once lived in the world, only a handful had survived into modern times. Some ancient races had been rendered extinct by war. Some had been simply crowded out, retreating into remote regions and forced to breed amongst themselves, which killed them off with lethal recessives.
That had been the bad luck. The foolishness had come when people began to form theories about the process of Evolution. They got it all wrong: most people interpreted the concept of “survival of the fittest” to mean they ought to narrow the gene pool, reducing it in size. So this was done, in genocidal wars and eugenics programs, and how surprised people were when lethal recessives began to occur more frequently! To say nothing of the populations who died in droves when diseases swept through them, because they were all so genetically similar there were none among them with natural immunities.”

— Kage Baker , book The Machine's Child

Source: The Machine's Child (2006), Chapter 29, “Still Another Morning in 500,000 BCE” (p. 330)

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Kage Baker 79

American writer 1952–2010

Daniel J. Fairbanks (1956) American artist

Source: Everyone is African: How Science Explodes the Myth of Race (2015), p. 12.

“The police case was very simple, because the robbers had been caught in the act of shifting the bullion; and as gold bars are more valuable than human lives, the robbers were given longer sentences than if they had been murderers.”

Arthur Calder-Marshall (1908–1992) English novelist, essayist, critic, memoirist and biographer

Mascott, R. D. (pseud. Arthur Calder-Marshall). The Adventures of James Bond Junior 003½. London: Jonathan Cape. 1967.

“In this unexpected scenario, the UFO occupants -- despite their obvious technological superiority -- are desperate for both human genetic material and the ability to feel human emotions -- particularly maternal emotions. Unlikely though it may seem, it is possible that the very survival of these extraterrestrials depends upon their success in absorbing chemical and psychological properties received from human abductees.”

Budd Hopkins (1931–2011) American UFO researcher, painter and sculptor

Source: Intruders: The Incredible Visitations at Copley Woods (1987), p. 190

“They were the misfits of the world, the outcasts, for they deviated from the norm of humanity as established through all of history. Yet it was this very deviation which made them the hope of all mankind. Ordinary human beings—the kind of human beings who had brought the race this far—were not enough today. The ordinary humans had pushed the culture forward as far as they could push it. It had served its purpose; it had brought the ordinary human as far as he could go. Now the race evolved. Now new abilities had awoke and grown—exactly as the creatures of the Earth had evolved and specialized and then evolved again from that first moment when the first feeble spark of life had come into being in the seething chemical bath of a new and madcap planet.
Twisted brains, the normal people called them; magic people, dwellers of the darkness—and could anyone say no to this? For each people set its standards for each generation and these standards and these norms were not set by any universal rule, by no all-encompassing yardstick, but by what amounted to majority agreement, with the choice arrived at through all the prejudice and bias, all the faulty thinking and the unstable logic to which all intelligence is prone.”

Clifford D. Simak book Time is the Simplest Thing

Source: Time is the Simplest Thing (1961), Chapter 31 (pp. 233-234)

“Somewhere, he thought, on the long backtrack of history, the human race had accepted an insanity for a principle and had persisted in it until today that insanity-turned-principle stood ready to wipe out, if not the race itself, at least all of those things, both material and immaterial, that had been fashioned as symbols of humanity through many hard-won centuries.”

Clifford D. Simak book Way Station

Source: Way Station (1963), Ch. 25
Context: That had not been the first time nor had it been the last, but all the years of killing boiled down in essence to that single moment — not the time that came after, but that long and terrible instant when he had watched the lines of men purposefully striding up the slope to kill him.
It had been in that moment that he had realized the insanity of war, the futile gesture that in time became all but meaningless, the unreasoning rage that must be nursed long beyond the memory of the incident that had caused the rage, the sheer illogic that one man, by death or misery, might prove a right or uphold a principle.
Somewhere, he thought, on the long backtrack of history, the human race had accepted an insanity for a principle and had persisted in it until today that insanity-turned-principle stood ready to wipe out, if not the race itself, at least all of those things, both material and immaterial, that had been fashioned as symbols of humanity through many hard-won centuries.

“Of late years… it has been successfully shewn that the human race might have had one origin”

Robert Chambers (publisher, born 1802) book Vestiges of the Natural History of Creation

Source: Vestiges of the Natural History of Creation (1844), p. 278
Context: Of late years... it has been successfully shewn that the human race might have had one origin, for anything that can be inferred from external peculiarities.