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Deducing that something is rare from limited evidence is really easy. If there is no good evidence regarding something, that default position should be that the thing is rare.

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There’s a handy cliche: absence of evidence is not evidence of absence. In concrete terms a zero is different from a missing value.

The cliche is wrong. The absence of evidence is evidence of absence. Not conclusive evidence.

There are an infinite number of things that don't exist and that we don't have any evidence of. It is nice if we can positively disprove them, but that is not necessary to justify disbelief.

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