It was Trump that signed a "peace treaty" with the Taliban that committed the US to leaving. Reversing that would necessarily have involved outright war with the Taliban, with a huge increase in US troops in Afghanistan and associated casualties. It was Trump who cut the Afghanistan government out of the peace negotiations. Trump did everything possible to undermine the Afghanistan government. The collapse of the government is on Trump. Yet somehow now it is all on Biden?
Conservatives/republicans have done just about everything in their power to encourage their followers to reject vaccination against Covid. They do not care that people, mostly in their "base", will die or suffer long term disability. No cost is too much, as long as they can prolong the pandemic and blame Biden.
What do Republicans have to offer for policy? Cult worship of a leader who has displayed over and over that he cares for nothing but himself. Censorship of education so students cannot even be taught that slavery was bad and has had lasting consequences. If you teach about the Holocaust you have to teach "both sides". What does that even mean? The worst attack on the peaceful transition of power in the country's history is rewritten as a tourist visit. They fabricate lies about the election to create doubt in their followers, and use that doubt to justify voter suppression laws.
The worst part of it is that so many gullible voters are falling for it. All you have to do to win in Trumpistan, it seems, is to lie and obstruct.