I try hard not to conclude right off that they are evil, and I try not even to conclude that what they said or did is evil. The thing they said or did might, however, have bad consequences that they didn't see.
(Technically, the argument I heard from anti vaccinators is that the adjuvants, not the vaccines are the problem, and they may affect only a small subset of the population in dangerous ways.)
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We attribute causality to the most prominent features in a problem space. In this, vaccines were initially suspect. Disproving any one will cause adherents to fall back to another. Actual science would test as many factors, in every combo feasible, before drawing conclusion.
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Conversely, opponents will claim that single contrary data point shows the adherents to be irrational when it is likely insufficient to reveal the whole truth. Again, it still isn't science, just interpretation based on beliefs.
End of conversation
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