IMO the proof may soon emerge. What seems to be becoming evident is that projections of the spread of CoViD-19 and accompanying deaths were grossly overestimated AND the reason the curves are flattening early is because the disease was already here in December, perhaps a month earlier!
This can be determined soon by testing a random sample of the population for antibodies. This could explain why California and Washington state now show low death rates and declining occurrence of the disease. Stories are popping up here and there of mysterious flu attacks that were not defeated by the flu vaccine in late 2019. Most victims recovered and those that succumbed were assumed flu deaths.
If the CoViD-19 infection was already here in the states prior to Thanksgiving -- HOW DID IT GET HERE? If it started in a West coast nursing home in January, how did it get to New York plus US Navy vessels?
Moreover, when POTUS took the unprecedented step of closing down air travel from China at the end of January - to howls by the usual suspects - did he already know that the US had been infected by a possible bio attack? For security reasons he may not be ready yet to reveal the whole dastardly scheme, just as Prez Ford never revealed the cause for his unusual steps in my aforementioned scenario.
Trump has to know more than we can see, he would never shut down our economy otherwise.
All great questions, Bob.