You are a very thoughtful guy. I basically agree with your speculations concerning Lentinman.
The dirty little secret is this: Genetic Defects of all types are cumulative. Both the mother and father pass their genetic defects on to their children. Over time, the human genome is becoming more and more degenerate.
Eventually, the human genome will be so degenerate that we will NOT be able to reproduce. Here's a video on this reality, called Genetic Entropy, if you are interested:
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