Justice doesn’t exist! We did worse things. Nobody deserves to go to that place, Alec said. Anyway, weren’t you Christian types supposed to forgive e… - Kage Baker

That wasn't very godly, Alec calls up to him.
And what has God to do with me? Nicholas shouts back. No voices speak to me out of any burning bush. No word at all. Hideous vacancy, monstrous indifference, and a senseless universe!
Well, says Alec cautiously, I would think that was a good thing. Shouldn't you have grown out of this by now? What do you want meaning in the universe for, anyway? Nothing means anything! We're just here to go along for the adventure.

Do you remember that terrible moment, señors, when the self-righteousness of your youth died? When all the stern warnings of your elders, ignored until the consequences abruptly came crashing down on your head, made you see in a flash that the warnings hadn’t been unfair or mean-spirited or blind, they’d been right? All along your elders had been trying to tell you about the black joke that is life, trying to help you and save you from pain. But you insisted on running straight into the trap, mocking them as you ran, to the agony that was irreversible and permanent, with no one to blame, finally, but yourself.
It’s not good to see yourself in the mirror then.

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.