"Hey guys, we need a surefire way to make our base stay home instead of vote when we have a literal fascist running who will end the Republic if he's allowed to win!"
Every vote that Biden loses to a third party means Trump has a better chance of winning the state. Unless you are voting in a pure Blue state like NY,CA, etc or a pure Red state like FL, OH, etc then you are giving Trumptard a better chance to win by not voting for Biden