There were side effects that were not disclosed or breezed over (such as the heart issues) and things we were told about the vaccine that were patently untrue such as that it would stop transmission of the virus.
Things like that play right into the hands of conspiracy theorists
edit: I took the vaccine because I know that ALL vaccines have that capability and I obviously felt that the rewards outweighed the risks substantially despite the fact that I have had Guillain-Barre' and can't even take the flu shot