That last part ought to be the kind of thing that hardly needs to be said. Alas, in Donald Trump's America, science isn't the number one reason for doing anything. And it's not completely Donald Trump and his friends that are guilty of that. Plenty of people pick and choose science that they think makes Trump look bad. However, the Trump administration sets the tone. "A fish rots from the head."*
In a decent world, not even a perfect one, the words of a Presidential Press Secretary wouldn't be a big story. Instead, the task force, or a subgroup within the task force, would gather real data, analyze it, and publish it. There would be a "conclusions and recommendations" section, which would include guidance about schools opening, and for people who are skeptical of those conclusions, and willing and able to think through a statistical and data based argument, there would be enough data to see how those conclusions were arrived at.
At that point, there still could be disputes. There really is a tradeoff between number of people who die and the degredation of quality of life due to trying to minimize the number of deaths. In other words, if we kept schools shut down to save 100 lives, I would say it's not worth it. If we kept schools shut down to save 100,000 lives, you would have to work hard to convince me that opening them was a good idea.
Unfortunately, in the real America we live in, the administration wants a particular outcome, and they will declare that outcome is what will happen, science be damned.
As for "the science" that the Press Secretary referred to today, here it is:
https://jamanetwork.com/journals/jamapediatrics/fullarticle/2766037
I think the conclusion she drew from the paper is a bit premature. Her comparison between flu and COVID-19 It was based on number of pediatric deaths from Covid-19 versus the flue between Jan 1, 2020 and April 28, 2020. Before making a decision about what to do in September of 2020, I think a refresher on the data, and a bit deeper analysis, is in order.
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*I picked up that saying from Michael Dukakis. George H. W. Bush made much of that line, expressing outrage that someone would compare the President of the United States to a rotting fish. Today, I think the outrage would come from the fish.