The notion that Biden represents a lesser evil compared to the chaotic reign of Trump is a common argument. However, we must not forget that there exists a moral threshold below which neither choice is acceptable. To suggest that enabling a literal genocide can be considered a lesser evil is a morally bankrupt stance.
Saying that voting for Biden is a moral obligation to prevent the return of Trump perpetuates a dangerous fallacy. It implies that the democratic party is immune from scrutiny and accountability, no matter the atrocities they commit. This line of thinking allows for a never-ending cycle of justification, as long as there's somebody considered worse, the democrats are granted a blank check. This is nothing more than a form of gaslighting, manipulating the public into believing that their only choice is between two evils, rather than demanding a better standard of leadership and true representation.
Why would anyone do that? It's a useless level of abstraction. I've never seen scientists looking into the composition and structure of the sun say "Why don't we apply the ideal gas law?" Because the answer is obvious, the myriad axioms the ideal gas law comes with aren't applicable in a gigantic ball of plasma. The only reason one would even attempt such an oversimplification is if they don't see the candidates serving the same interests structurally, and hilariously the exact same in some cases.
I will regardless offer you a simplified approach, so that you may use it to synthesise your own. It consists of 3 questions regarding policy differences: (1) how has the issue come to this [under Biden for stuff that happened in the last 4 years], (2) how do I really know the other guy will be that much worse, and (3) if there definitely is a difference, is it significant? Let's use 3 issues to look how it turns out.
Palestinian genocide: (1) Although the zionist entity has been murdering Palestinians for decades with impunity, the massacre that's been going on is unprecedented. 35k dead, 11k of which are children, and fuck knows how many more indirectly, as a result of conditions imposed by the zionist entity. (2) Amy argument that Trump supports the zionist entity and it'll get worse is moot. Biden called himself zionist on multiple occasions, and the most he's done is to not sell arms to be used in Rafah, not even s stop the sake of assume altogether.
Abortion: (1) Roe v Wade was undone under Biden. He didn't have Dep. of Health policies changed to safeguard it, he didn't withhold funds from states that criminalised abortion, he didn't stack the courts. (2) What's he going to do, double ban it?
Cannabis: (3) Biden regime sent out a note unofficially saying they'll reclassify cannabis. Not only is that gesture miniscule when they could work to declassify it altogether, it's done when he doesn't have congressional support so likely won't happen anyway.