it's not the responsibility of voters to vote for certain politicians, it's the responsibility of the politicians to represent people so they vote for them.
if you think joe biden is gonna lose then you gotta force joe biden to take more popular positions (he is literally running right now it's the time you make up your platform), not yell at people "refusing" to vote for him as if they are just petulant children refusing to eat their veggies and act like the most logical and rational option is locking your vote for joe biden and whoever disagrees just cannot understand the correctness of your reasoning.
(to be clear i'm not american but it's just ridiculous how many times i have heard this exact song and dance)