Along with the cynical, pessimistic, and snarky answers, bear in mind the market does not reflect what is happening now. It reflects an averaged, time-value-of-money-weighted assessment of what the market participants think it's going to happen in the future.

So, despite what you may naturally think, the market crash wasn't reflecting the fact many people aren't working right now, it was reflecting the fear that we could be knocked out for months. Now fears about the worst-case scenario are receding, so the time-averaged result rises as the result of the worst bottom elements lifting, even if the overall assessment is still problematic.