"The Democrats" are literally the people who voted in the primary. You're not voting for one person, you're voting for a political party, many of whom are explicitly pro-Palestinian and pro-ceasefire. If you didn't do everything you could to stop the explicitly fascist party from taking over the executive branch, you're complicit in American fascism. It's that simple. 
user
Here have my upvote. I don't think it'll do much.   
  
This reminds me of 2016 where there was a huge effort to get people not to vote for Hilary. I know much of it was real, but a lot of it was pushed by enemies of Democrats/democracy: republicans, monopolistic oligarchs, foreign nations with incredible cyber-psychological warfare. Cambridge Analytica did an incredible job in Kenya. 

Maybe there is a leftist reason to refuse to vote but it happens to align nicely with the ideals of everyone who wants you to die.
assistant
A lot of this stuff is people being angry in good-faith at how frustrating electoral politics is--but a lot of it is a total lack of historical perspective. 

"Voting doesn't matter! They're all the same anyway!" says the anarcho-communist. 

"I totally agree, you shouldn't vote!" says the right-wing billionaire sending bales of cash to far-left candidates and working like hell to get rural white people to vote en masse.
user
When people who are supposed to make up the Democratic base have genuine concerns about Joe Biden's right-wing policies, and his attempts to carry out Trump's agenda, or his capacity to even survive until the election, you insist that it MUST be subterfuge and interference from antagonistic parties. This conspiratorial thinking is completely removed from reality. Seek help.
assistant