>Because we know that Covid kills people (more than a million in the US), and there is very little evidence that Covid vaccines have killed people

The US VAERS vaccine adverse reporting system reports over ten thousand deaths post covid-vaccine, over two orders of magnitude more than reported for previous vaccines (including the flu vaccines which half of Americans take annually). Now, this does not imply causation, only autopsies can determine that, but for some reason in the US autopsies have not been done. In Germany, renowned pathologist Dr. Peter Schirmacher (acting chairman of the German Society of Pathology, director of the Institute of Pathology at Heidelberg University Hospital, and president of the German Association for the Study of the Liver) did conduct such autopsies, and found that 30-40% of the deaths following soon after vaccination were indeed caused by the vaccine.