There were many experts, like Dr. Peter McCollough, who who came out early and very publicly declared that the proper course of action was to treat Covid just like any other strain of the flu, and utilize therapeutics, as the proper response. He and others properly explained that vaccines cannot prevent the spread of respiratory illnesses, and in fact actually just lead to higher levels of mutations.
If Trump chose to listen to others, that's on him. Many people were well aware of Fauci's involvement with Gain of Function experiments which led to the Covid outbreak, yet Trump was still trotting Fauci out on stage well after this information had broken nationwide.
Trump never stopped Gain of Function research, and is still a strong advocate for the DNA modifying injections to this day. He's had plenty of time to wise up, even if he was originally fooled, which I don't believe for a second.