In universe, I don't think anyone really understands this, anymore than they understand why the United States of Lizardia exists (to quote the book: "Nobody even pretends to explain any of this without talking about
'gods with a weird sense of humor.'" - IW149). But I think something like David Jonston's explanation has to be correct:
Quote:
Originally Posted by David Johnston2
Myth parallels tell us that human thoughts affect the selection. Therefore differences that almost nobody would care about do not manifest as reachable parallels.
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This is actually hinted at more directly in the source material. See the section on the "Williams-Khor Hypothesis" (IW21), which postulates that quanta are pin fact psychic constructs!