That probably due to conservatives' jaunticed view of the mainstream news media and what they see as a history of twisting the news to make Trump look bad. They look at the medias' belated enthusiasm for reporting on Covid-19 and attributed it to (what they see as) their desire to torpedo Trump at any cost.
In my opinion Trump merits a solid "D" for the government's response-to-date.
In spite of Trump not wanting to own it, he is still the Chief Executive. Even if the CDC was protecting their turf (a classic Deep State move), Trump is still their boss.
Sorry folks, when you are talking about my life and the lives of those I love, there is no grading-on-a-curve.
North Korea sets the bar for getting an "F". They executed the first patient. That makes it tough to get histories and establish perimeters.
China essentially arrested the first doctors that tried to blow the whistle. They get an "F+".
Everybody else, except the South Koreans, gets a "D".
South Korea gets a "C".
Republicans are pissed about Covid-19 because it tanked the stock market and that reduced Trump's chances of being re-elected. That ship sailed and is not coming back before the election.
One point that is hugely in Trump's favor is that he is not afraid to contradict himself. That is, he seems almost immune to the sunk-cost-trap. When he gets better information, he runs with it, even when it makes him look foolish.
In a very dynamic situation, like this Covid-19 appears to be, that is an asset. What was accepted as fact last week is now known to be very wrong. Undoubtedly, much of what we think is fact this week will be proven wrong. The half-life of a Covid-19 "fact" is about ten days.
In general, the American electorate has shown a strong preference to not change horses in the middle of the stream as long as that horse appears to be moving decisively. Trump is a quick learner. I expect him to have a "C" by next Saturday.
Just to be a rabble-rouser, what happens if both Biden and Sanders get it and die? Tulsi is still the only other Dem officially still in the race.
---Edited to add---Another major difference between Democrats and Republicans is that urban people are more likely to be Democrats. As a practical matter, I have certain freedoms living in Eaton Rapids Township (population density 100/square mile) that somebody living in the Bronx (population density 34,000/square mile) cannot exercise.
The behaviors of the person living in the Bronx must be coordinated with the behaviors of far more people than for many of us living in fly-over country. The news media, for good or ill, is one of the major organs that act as the metronomes coordinating those behaviors.