Some of Karl Denningers comments about why he thinks it was stupid.
"ONLY A STERILIZING VACCINE IS SAFE TO USE ON A MASS POPULATION BASIS WHEN A PARTICULAR PATHOGEN IS CIRCULATING IN THE ENVIRONMENT.
THIS IS NOT THEORY -- IT IS DECADES-OLD KNOWN MEDICAL FACT.
In addition natural infection with Covid-19 is sterilizing. Being infected and recovering conserves the nasal and respiratory mucosal response which is where the virus enters the body. Natural infection also conveys both "N" (nucleocapsid) and "S" (spike) antibody knowledge and T-cell recognition but the "N" knowledge is much stronger as coronaviruses have evolved to evade the immune system with the "S" portion through millions of years. This is why they can infect you in the first place. The "S" portion undergoes mutation at a quite-rapid rate while the "N" portion is conserved. It was thus expected that prior infection would lead to durable (years to decades) of resistance and indeed that's exactly what we have found thus far. Indeed in a small study it was found that this recognition extended to the bone marrow in a large percentage of cases and in those people is likely to confer decades-long if not lifetime protection. This is not true for "S" induced immunity as it wanes rapidly and, far worse that is where the mutation is taking place and thus where escape risk lies."