My last attempt

superchuck500 said
I certainly can understand the compulsion to warn others of a danger you believe to exist. If I was on a trail and I believed there to be a hungry grizzly bear around the bend, I would warn others of that danger. I would feel a moral obligation to warn others.

If there’s actually no bear, I appear the fool - but my intentions, at least, remain unassailable.
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So let's change the hypothetical just a hair. What if people who have never spotted a bear on the trail cautioned about a bear there, acting like it was a certainty even though no one had ever seen one or any evidence of one. And they had done that consistently for 2000 years. At some point their intentions are also suspect.