This article provides good food for thought. It raises two important questions:
1.
"One of the great mysteries that has emerged from the Covid-19 pandemic — and one that’s still being investigated by infectious disease specialists — is why some people catch Covid and others don’t, even when they’re equally exposed to the virus."
2.
"Another question that has arisen during the pandemic is why two people with Covid may respond so differently to the infection; one could have heavy symptoms, for instance, and the other could be asymptomatic."
The article says, "An increasing amount of research is being devoted to the reasons why some people never seem to get Covid — a so-called 'never Covid' cohort," and it explains the present state of that research.
I think it is fair to say that regarding COVID-19, nothing is true in all cases. Vaccines help, but not in all cases. COVID-19 kills people, puts them in hospitals, and/or makes them very sick, but not in all cases. People who get infected with COVID-19 are asymptomatic, but not in all cases. Because COVID-19 easily spreads, it is a serious threat to people, but not in all cases. COVID-19 is deadly or more serious for people with underlying conditions, but not in all cases. COVID-19 is more deadly or serious for older people, but not in all cases. Scientists and researchers develop true facts, but the facts are not applicable in all cases. Certain medicines are effective in treating or preventing COVID-19, but not in all cases.
Far too much of the COVID-19 debate hinges on people's willingness to stridently (and ignorantly) embrace certain aspects of our COVID-19 reality and assert those as if they were true in all cases. It seems to me the wiser approach is to think in terms of probabilities, not absolutes. Regarding COVID-19, if you believe something is true in all cases, you will be continually frustrated by the exceptions that undermine your absolute of choice.