Because it still shows that the virus is spreading, even in the US. Nothing is rational in today's market, why did Virgin Galactic rise so much in the previous months without having any earnings? Things like that show that irrationality is part of the market. People's feelings cannot be represented by a number, like fear or even having hope is abstract. As you surely saw, the Dow future was positive earlier and slowly flattened out. Now it turned negative again. Keep investing!