Andrew Slack (58)
should alert you to the possibility that "the science" and our political masters don't really know what they are doing.
"Science" is a method. Testing, analysing and revising the answers repeatedly—by definition—means the medical advice evolves and changes.
What are the alternatives?
If you need answers set in stone then perhaps Exodus 20:2-17 is your speed. Or maybe something that is "Gospel" with the added bonus of being literally good news?