If you go to his Twitter account you will see that he's found information to suggest that having an immune response to the "spike protein" does not seem to be as protective as having an immune response to other parts of the "virus". If that's the case what was the reason they chose this antigen? (link: https://twitter.com/AlexBerenson/status/1388576508189544448 )

The linked thread indicates that the spike protein by itself can damage blood vessels. It would have been nice had vaccine researchers and developers paid attention to this prior to the rushed vaccination of millions upon millions of people.