I think there were 2 false hopes: 1) that the virus is somehow getting less lethal, and 2) that we are getting much better at treating it. These may both be true to some degree, but not enough to prevent the huge numbers of deaths that are likely right around the corner given the hospitalizations.
Our state finally implemented a statewide mask ordinance today. People may start to take the virus seriously again, but it might be too late.