Fuck this system for making me choose between bad and worse
Don't make me defend the US voting system but that is not how it works. Primaries exist and that's where voters make the case for a specific person. The large, general, national elections are for forming coalitions and compromising. This is what we do to decide who gets power instead of physically fighting. There will never, ever be a time when a single candidate is the ideal choice for a majority of Americans. Compromise is a core tenant of democracy and by definition it means nobody gets everything they want.
And while we're on the topic, 99% of leftists understand this. Anyone telling you "voting doesn't matter" or that "both candidates are the same" is just trying to reverse the progress that's already been made.
Your point? If you have conservative values, then not supporting Trump does indeed help Biden to win.