Common sense is what you lack.
Trump was very anti everything during covid painting the numbers as fake and a hoax, which took the Magats to also a place of opposing everything.
Then when there was a vaccine break thru, Trump being Trump and wanting credit (which he did deserve) tried to switch and say 'here is my great vaccine to address the hoax virus', so of course the magats were not going to celebrate a vaccine for something Trump had already convinced them was a hoax.
Trump just got caught in his two competing motivations. To first deny everything and call it a hoax, but then to want credit for the 'fix' after the fact. Because Trump is stupid, like his poorly educated magats, he could not see how this was going to backfire on him and did.