I'd be forgiving on that as we've had several pandemic scares before that panned out to nothing in the US.
Even Republican officials told Americans to go out and dine.
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March 15, 2020
“Representative Devin Nunes, a California Republican, on Sunday encouraged healthy people to dine out at restaurants, contradicting public health advisories that strongly encouraged social distancing and discouraged Americans from attending mass gatherings.“
That link you posted is an example of the rewriting of history, because those policies were "forged under Obama" which the blaming of Trump for them, conveniently neglects to mention. Same for the cages, war mongering, and divisiveness in our society today.
https://www.msnbc.com/opinion/anti-muslim-policies-forged-un...
https://www.speaker.gov/newsroom/13120-2
And you are correct, people from both parties played down the virus well into March. Mardi Gras wasn’t canceled at the end of February.
These people simply didn’t know how dangerous the Coronavirus was.