Some people believe strongly in social justice and because of their good intentions they are willing to look past issues within the ideology. There are also those who know little about politics and really believe that Trump is comparable to Hitler ymsh. They think it’s their duty to vote him out and save the world. Finally, there are people who believe in Marxist ideologies and think that it would be ideal. Those people are willing to sacrifice freedom, truth, and justice, to pave the way for the implementation of those ideals.
Some people have good intentions, such as the first mentioned group, others not so much. Ultimately, those who support Biden have an entire different life view, which to them, makes their position justified and good.
Personally, the values with which I was raised dictate that I hold other beliefs.