Science of course should play a major role. Only it can determine a vaccine’s likely medical effectiveness and side effects. But science cannot possibly determine what is the acceptable amount of risk to be traded off against reward. Should approval be given to a vaccine that’s 98 percent effective but which carries a 0.05 percent chance of causing serious and possibly fatal illness? What about a vaccine that’s 90 percent effective but which carries a 0.002 percent chance of causing seriously illness or death?
-Don Boudreaux, as culled from this letter
Which reminds me:
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