One thing for certain about COVID19, we know almost nothing. The Swedes are building herd immunity, that's their strategy. Perhaps they are taking a big hit now, but a few months down the road to a year, they stop dramatically the deaths once everyone got COVID, no need to wait for a vaccine.
You do realise that there are measures in Sweden as well? And that the people in Sweden seem to be very responsible about following the measures?
In Sweden, currently 1 person infects about 2 others. Meaning the virus will keep on spreading exponentially. Albeit with a relatively low exponent, thanks to their measures. Yet with an infection rate of almost 2, they still risk getting into serious trouble.
To give you an idea, this graph shows you something to think about. The full lines are the model of the amount of hospitalisations, people in ICU and deaths in case there were no measures taken at all in Belgium. Meaning: one person would infect 4 or 5 others.
The dots are the actual numbers. They follow the curve for a while, then you see the measures' effect. Measures in Belgium made the infection rate drop from about 5 to about 0,6 (though possibly 0,8 now).
You say we know almost nothing about COVID19. Yet one thing we are very good at, is building a model to make projections. Do you see the blue, red an black lines go up? Do you notice the difference with the dots? On April 10th, the measures in Belgium had already saved 8200 lives. People alive today that would have been dead without the measures. The number of saved lives today will probably be in the tens of thousands.
This for a small country like Belgium. Imagine those numbers in the USA.
Also, Belgium yesterday:
Sweden 4 days ago:
Note that the lines in Belgium go down. And even with our measures, we'll be looking at 10.000 deaths easily.
The lines in Sweden keep going up on the logarithmic scale.
USA is rather similar to Sweden. People who believe that there won't be more than 60 or 70k deaths in the USA are VERY optimistic or expecting a miracle.