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It’s far, far, far better to be overcautious here than under.

Several of Mr. Biden’s aides who served in the Obama administration said they were overcautious the last time, fearing that the protesters would be tarred as instigators linked to the C.I.A.

And because our bodies would much rather we be overcautious, our recollections of agony are often exaggerated.

“I think it’s overcautious, but I see where they are coming from,” said Mike Levay, 25, a digital properties manager in Philadelphia who was walking through the city’s main Amtrak station on Monday morning.

We tend to be an overcautious and, therefore, dull group in such settings.