interpretation
"perhaps the dead did not really return. The return of the dead is simply their reluctance to disappear completely. Simply a residual effect... that the living have trouble shaking loose."
-Robin Campillo
Perfectly stated. Your explanation covers why many people's loved ones (particularly the one's with no interest in checking) did not return. Those who had come to terms with the mortality of their loved ones did not see their manifestations.
shareIt could also explain why all the returnees were recent deaths (within 10 years). People who lost their loved ones over a decade ago seem more likely to have accepted their losses and moved on.
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