I went out of my way to study especially some of the mathematics used for modelling projections into the future.
I not only read about the SIR model, but poked around a few of its variants like SIRV, SEIS, MSEIRS, etc... I even ran a few up in Mathematica and toyed around with different parameters, trying to get a feel for how the errors accumulate and what can and can't be predicted.
Just that little tiny corner of the pandemic response is insanely complicated once you get into the weeds. You have to account for what fraction of the infected actually turn up for test. What fraction of the tests are false positives or negatives. How fast mutations spread and distort the test results. How other countries or even counties report their statistics differently. And so on, and so forth.
Once you get a good feel for a tiny part of the big picture like that, it makes it much easier to gauge who's spouting bullshit, and who's also been in the same weeds as you have and is covered in cuts and leeches.
At the end of the day, the numbers said 'x'. Everyone that sounded like they knew what they were talking about agreed with 'x'. Everyone who sounded like they were making things up to suit their selfish agenda never used terms like MSEIRS, "infection-to-test ratios", or any such thing. They also seemed to use many different numbers, sometimes making up new numbers in the same conversation. More commonly, they wouldn't use numbers at all, and talked instead about freedom or human rights. Emotions and feeling that might get hurt.
Here's a number: so far at least 6 million people have died, of which 1.1 million were in the United States alone.
The numbers said it would have been a lot worse if prompt action wasn't taken. Ten times more deaths or even worse were entirely within reasonable projection bounds.
Yet... people keep arguing as-if 6 million people hadn't died. As if hospitals hadn't been overwhelmed. As if we lived in some sort of counter-factual universe, or we could choose to live in such a place through sheer force of will.
As if we could berate the virus into not mindlessly replicating exponentially in order to appease our God-given right to freedom and profit.