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.
That's also a really good point, dems can get away with more because they do the hand wringing publicly acting as if they're doing heinous shit against their will. What they're doing in Gaza is a perfect example of this dynamic. They just keep saying how they're working to stop the genocide, which is what people want to hear, while actively doing everything to facilitate it. And another related factor is that while most people do find republicans appalling, there is enough of a base that doesn't. So, republicans can always come out and say the most heinous shit that's going to scare the majority precisely because there's a significant minority that wants it. So, the threat of the greater evil is always going to be there.