If you all are still not seeing a difference between Trump and Biden over the last few weeks, e.g. Trump ordering the police to violently clear peaceful protesters so he could have an awkward photo op in front of a church compared to Biden sitting in churches listening to Black people talking about their pain, then have fun with your virtue signalling. Because that's all you're doing.
I have Black children, I don't have the luxury of making meaningless gestures. Must be nice. There are indeed far too many 20% turnout elections, but I make sure I vote in every single election I am eligible to do so; no matter how "dull" the contest or issue at stake. That's the minimum I can do. You Bernie supporters were aggressively loud, but when it actually came time to vote, most of you forgot where the voting booths were. That's on you.
Bottom-line is you do you. Trump is the incumbent President, and that bestows enormous advantages in elections, so he very well could be re-elected. But the cold equation of election calculus is this: any non-affirmative vote for Biden is a functional vote for Trump, either not voting or voting 3rd-party. So yes, it will be on you if Biden loses. So enjoy the "scapegoat" mantle. But all good if you don't care, right? Smoke a bowl and fight the power, bro!