A shutdown by itself is not a solution.
I agree 100%! Most countries that have been successful at containing the virus, such as Taiwan, South Korea, and China, either didn't use a shutdown at all or used it in combination with other methods, such as test, trace, treat, and isolate. A shutdown is the method of last resort.
You are absolutely correct that it would have been better for me to say they SF Bay Area acted quicker than NYC and that is why the had much less of a problem.
Unfortunately the US doesn't have testing and tracing in place yet so we are in a bind. The shutdowns bought us time, as you said, but that time has been squandered just like the months of January, February, and March were squandered.
One of the most informative graphics about what is going on is covid trends. Most countries started out with exponentially growth with cases doubling roughly every 3 days. Then when countries put countermeasures in place, the growth stops and the number of daily new cases plummets. You can see that the US does not yet have the virus under control. We should not be lifting the lockdowns if we don't have other measures in place. To successfully fight this virus you need to be pro-active not reactive. Opening up too soon without other measures in place will be retro-active, and destroy what was gained through great sacrifice. The US is in a bind.
However this also means very few people [in the SF Bay Area] as a percentage have got infected and have immunity. As offices open up next week how will the Bay Area deal with it?
It sounds like you are referring to herd immunity. Unfortunately you need to have at least 70% of the population immune for herd immunity to have an effect. The UK toyed with this in early March going so far as to say that they wanted people to get infected.
That plan was utter idiocy and they soon backed off from throwing their country over the cliff. The problem is that when 10% or 20% of the population gets infected like in NYC, Spain, and Italy the health care systems get overwhelmed and this causes the death rate to go up. In Spain they were euthanizing people on ventilators who were over 65 to free them up for younger people.
If two places open up the same way, the one with the most active cases will have the most risk of the virus spreading rapidly again. There is little difference between having 0% of the population immune and having 20% immune.
The US is really between a rock and a hard place. They used the crudest tool possible, the general lockdown. Then they screwed over the working class by not guaranteeing them a substantial portion of their salary which was done in France and other places. Plenty of "stimulus" money was spent in the US but the vast majority of it went to fill corporate coffers. This means the lockdowns are not sustainable. But the US really screwed the pooch by squandering the first 5 months of 2020 without implementing test, trace, treat, and isolate.
Unless the US starts acting sensibly the situation may get much much worse both economically and health-wise. The only rational reason for the actions of the US government is if they want to create massive social unrest.
Whether planned or not, that seems what we are headed for. There are some glimmers of hope though. The biggest one I see is taking Vitamin D daily. It's been known for years that Vitamin D is essential for the immune system to function properly in fighting respiratory infections. The mechanisms are known and there have been many studies showing how effective it is.
We don't yet have double blind clinical studies of using Vitamin D to combat covid-19 but the circumstantial evidence is overwhelming. A study from Malaysia found that having sufficient Vitamin D reduced the covid-19 death rate by a factor of 8! Vitamin D deficiency would go a long way to explaining the racial disparities in severity and fatality. Our skin creates Vitamin D naturally from sunlight but darker skin create it much slower and people with darker skin tend to have a higher prevalence of low Vitamin D. But many light skinned people also have low Vitamin D.
Vitamin D is much safer than HCQ. It's also dirt cheap. You can get a year's supply in the US for $15. But the best thing is that many studies have shown it is very effective against covid-19. This is not at all surprising since it is known to be a vital for our respiratory immune system to function properly.
It's possible that Vitamin D is the magic bullet we need to make it safe to lift the lockdowns (if used along with common sense tools such as wearing masks and social distancing).
I don't know why the US and Europe bungled this so badly. One thing seems clear. If there is some sort of deep state that is really in control they they are just as stupid and scientifically and mathematically illiterate as our leaders. I was hoping that at least one European country would take this seriously in time to prevent a significant outbreak. That country could have been a model to the rest of Europe and for the US. But alas, they all bungled it.