I don’t like Biden either, but anyone with half a brain knows there are two choices in the 2020 election. If we had a sane voting system, voting third party might be worth it, but as it stands, no one but you knows your favorite candidate exists and unless you want to become their campaign manager that will still be true in November. Even if you did, and even if you convinced two thirds of the people who would otherwise have voted for Biden to vote for your chosen candidate instead, Trump would still win because half the country voted for him and your guy only got a third. If you vote third party you might as well stay home.
Not voting isn’t going to stop the genocide in Gaza. The US will continue to funnel them arms no matter which candidate wins this November. Trump practically campaigns on how much he hates the Jews. He’ll also make life a living hell for anyone who isn’t a straight cisgender male back here at home.
A vote is not an unconditional endorsement, and “sticking it to leftists” and “refusing to support genocide” (that’s not what voting for Biden is doing, by the way – a vote for either candidate is a vote for genocide and a vote for neither is an endorsement of both) is not more important than keeping the furthest right politician America has ever seen out of office.
I hate Biden as much as every other leftist here. But I’ll still vote for him because Trump is worse. If there’s a single bone in your body that cares about the lives of your trans friends you will too.
The thing I generally disagree with is the idea that Democrats would move leftward, and not just further into Liberalism. Even Social Democracies in the Nordic countries are seeing a decrease in the welfare state, just like Reagan did with FDR-era policies.