The fatality rate is only as low as 0.5-0.9% in countries that
aggressively locked down, quarantined, and built temporary medical facilities in order to flatten the curve so health care facilities could keep up with urgent cases.
In places where no aggressive action is taken, fatality rates are much, much higher (3-5%) — because otherwise treatable cases can not be treated, and the marginally more ill die for lack of treatment.
The difference between 0.9% and 3% of the US population (per Census.gov ~329 million estimate) is 6.9 million people.
https://medium.com/@tomaspueyo/coronavirus-act-today-or-peop...