You know, right from the beginning, Trump was responsible for his supporters' beliefs. He delayed even announcing that there was a pandemic. He refused to wear a mask (because he claimed it would make him look "weak") and he told lie after lie after lie about where the pandemic was going.
He denigrated Dr. Fauci and told people that Covid was no worse than the 'flu.
He claimed that the vaccine had not been available until five days after the 2020 election so that Joe Biden would win.
But he sowed the seeds of doubt in his supporters' minds, that social distancing, mask-wearing and being vaccinated was for weak-minded individuals. They believed that Covid was a left-wing conspiracy and that the vaccine was dangerous and that Bill Gates wanted to put a microchip in everyone, right from the beginning.
It made no difference that he then told people that they should get vaccinated and boosted - it was too late, and people started to boo him at rallies where he said this.
Truly he has blood on his hands.He only did a U-Turn with regard to vaccinations when he realised that his supporters were dying off in droves.