The one, single man who is the current President of The United States Of America, can change what he’s doing on a number of subjects, including his active continued material support for the Israeli Genocide, to get the votes.
Millions of people can go against their principles and vote for that man so that Trump doesn’t win.
Logically it would be much easier to achieve the objective of Trump not getting elected by the solution of that one, single man to change how he acts as President of The United States Of America, than by the solution of the millions of people turned of by the actions of that man as POTUS to ignore their Principles and vote for that man.
Surelly if the people loudly demanding that others ignore their Principles and vote for Biden so that Trump doesn’t win had indeed only “make sure Trump isn’t elected” as the purest of motivations and were not at all driven by tribalism, they would be concentrating their pressure not on the millions it takes to convince to win the vote via that solution but on that, one, single man, who persists in acting in a way that turns millions off from voting for him.
For an outsider like me, the persitence on the “lets convince millions” option instead of “lets loudly demonstrate on the streets against Biden until he acts differently” looks like pure mindless tribalism of “The Chief is always right and even if he isn’t he’s our Chief so we’ll stand by him” kind. (Totally valid. Just don’t be a hypocrite and claim it’s about making sure Trump doesn’t win, as that objective can way, WAY, WAY more easilly be achieved by your Chief starting to trully listen to those whose votes he wants).