> This is only true if we presume that it was equally spread across risk strata. But it's also possible that it didn't make its way from younger travelers into the higher risk stratum in sufficient measure to start causing significant mortality for weeks.
It may not have been equally spread across risk strata, but in a pre-lockdown world, even if you are in a low-risk group, you have social contact with people who are in high-risk groups, through public transit, grocery stores, services that you visit, relatives that you visit, hospital waiting rooms, urgent care waiting rooms, hospital wards where doctors don't wash their hands as frequently as they should, workplaces, and the list goes on.
Is it possible for a small group of people (low thousands) to have had the virus across the country, when the official count was in the tens and low hundreds? Absolutely! I can see this happening. It seems to fit with the pattern of infections flaring up all across the country at roughly the same time.
Was it possible for millions of people to have had the virus (which is what the sero data points to), for over two months, without getting other people sick in a manner that would show up on the statistics? That is an incredibly strong claim, with only one data point that supports it, and a lot of data points that oppose it.
With the benefit of hindsight, it is clear that the sero data was not a good predictor of the future in March of 2020. What has changed about it, that makes it a good predictor of the future in March of 2021?
> I can't tell you how happy I am to be in Florida (no lockdown, mortality substantially below average, risk-adjusted mortality notably and incredibly low) instead of my home state of NY (intense lockdowns and a resulting bloodbath).
If Florida had the population density of NYC, with people of all demographics sharing the same public transit infrastructure, sharing the same elevators, packing the same grocery stores, it would be a graveyard. You're ignoring all sorts of conflating factors, by pointing at two vastly different datasets, and concluding that because one had a lockdown, and the other one didn't, lockdowns don't work.
Counterpoint - Washington state has had lockdowns, and despite having a similar population density to Florida, has half the death rate of it. To the surprise of absolutely nobody, death rates are much higher in counties with lower compliance rates (Yakima versus Pierce, for example...)
Oh, and when lockdowns would get relaxed, three weeks later, like clockwork, infections and deaths would spike up.
It's an infectious airborne disease. The more people that carriers are in close quarters with, the faster it spreads. Reducing the number of people the average person is in contact with, healthy, or otherwise, reduces it's rate spread. I am not sure why this is still controversial in 2021.