If Biden seriously made that offer in b) I would be very strongly tempted to stay home on election day.
People keep lying to themselves and trying to believe that Trump is the problem and that he's not just the most visible symptom of a Republican party that crossed the line way back in the 1960s when they started campaigning to get the KKK's votes and undermining our foreign policy/national security for political wins. Haley, Romney, Cheney, etc. - they are all threats to the country as is anyone who collaborate with any of them.