They are likely those that are fed a straight diet of Russia, Russia, Russia and other assorted Trump hate stories. They have never heard an opposing view. They also likely never heard anything bad about Biden. The same goes for them thinking blm and antifa are peaceful groups that just want racial harmony and that the NRA sells guns to street thugs.
I work with people get their news like that. They have one news source and they believe everything they are told. They react to a differing opinion like a demon in a horror movie when they get splashed with holy water. If we had an honest media, Biden never would have been elected into the senate. I would wager that if we had an honest media, most politicians would not have gotten elected.
Even such enemydia-fed Biden supporters must have a huge scotoma not to see Biden’s dementia will result in “Heels Up” Harris becoming a 25th amendment-authorized president within several days (hours?) of a Biden presidency.