From your point-of-view, the Democrats winning may be good, and the Republicans winning bad. You might see them on a left-right scale of 0-10, where 0 is good, the Ds are at 3, the Rs at 9, and Hitler at 10.

Some other people see a bigger window than that: look at https://www.politicalcompass.org/uselection2020 and compare how these people see the distance between Trump +9+9 and Biden +7+6, compared to the distance between both and Hawkins -5-3. These people agree that the Rs are worse than the Ds, but they don’t want to help the Ds win because they don’t want more genocide, a climate cascade causing a mass extinction event, a psychotic economic system, a food system torturing 2-6 trillion animals to death a year and enslaving 2-4 trillion animals in torturous conditions a year, unsustainable pollution, biosphere degradation…

They might instead want to help in the long fight towards an ethical civilization instead. It may be a long defeat, but for those who won’t cross the ethical lines listed above, doing the right thing (even if they lose) is better than being culpable in actively supporting those who are making the system more evil. The difference between +9+9 and +7+6 is real, but for some the ethical lines they won’t cross is below +7+6.

If Stalin is the lesser-evil compared to the greater-evil Hitler, then there’s still the option to vote for unpopular Gandhi and maybe start the process where people realize they don’t have to be culpable in actively supporting Stalin.