So, as a physicist, you should know how exponential growth works. Let's say you have a pile of Uranium that's juuuust sub-critical. You would likely to be confident to stand next to it without significant fear.
But if someone throws on just enough additional Uranium for the pile to go supercritical, you would run for your life because none of the following will matter[1] all that much to the final outcome:
1) How much neutron radiation there was to start with.
2) The specific exponential growth coefficient.
3) How much total Uranium there is, as long as it's a nontrivial amount
4) Whether your Geiger counter is off by some constant factor or not.
None of those matter. It's going boom. It might go boom a bit sooner or a bit later, but it is going to go boom. That's just how exponential growth works. There's no maybe. There's no "let us wait and see". There's no "we'll hope for the best". No: It. Will. Go. Boom.
All of the factors that are irrelevant are just shifting a figurative vertical wall on your graph paper a bit to the left, or a bit to the right. It's adding or subtracting "a couple of doubling times". If the doubling time is short, then you're not really achieving anything by fiddling with constant factors.
With the Coronavirus just about every country has a doubling time of 4-5 days.
I live in Australia, where we're about a "month behind" everyone else. So of course, the dumbass government is saying things like "the heat here will slow it down". But it hasn't, our doubling time is 4.75 days at the moment. They're saying that it's "premature to lock down the country". No it isn't, it's already weeks too late and getting literally exponentially worse daily! They're saying that the hospitals are being prepared, but no amount of extra beds or ventilators will help. If they double the number, it just delays the catastrophe by 4.75 days. Not even a whole week! Quadrupling beds and ventilators buys just under 10 days before people are being turned away to go home and die.
So, again. I ask you: If you were the nuclear physicist in charge of a nuclear pile and someone told you it's gone critical and the radiation is rising exponentially, is your first reaction to: just "stand around and wait and see what happens", or to: take drastic action right this second? Do you SCRAM, or do you call the communist party leadership for permission? Are you the hero of the Chernobyl story, or the villain?
[1] Ignoring thermal effects slowing down the reaction. This actually has an analogy with disease spread, where there are fewer susceptible people remaining because everyone is already sick or dead. If we reach this point, we'll be seeing millions infected and hundreds of thousands dead.