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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Indeed, reminds me of people flashing their lights to warn of a cop waiting to zap you. If you're speeding, you're thankful and slow down, if you're not, the flashing lights are a nuisance. If there's no cop, then the guy flashing his lights is bugging everyone for no good reason.