or did not do. He should have investigated Bush, Cheney, and others but instead he decided to "Move Forward" which left people who had committed crimes running around and becoming "artists", etc.
What Freud warns is about the powerful/rich class getting away with murder and the people from lower classes seeing it happen, knowing that THEY, the lower classes, cannot get away with murder like the powerful can. The consequences of such inaction can bring even violence (the French Revolution), and from the Democratic Party view it can bring such level of dissatisfaction with our Democratic leaders, including Biden, that next election they may say "if this guy did not punish the criminals, why should I vote for him again?", in other words, people will feel betrayed like many Democrats felt because Obama decided to move forward.
The theories that say that trump won because Democrats forgot the poor and blah, I find it hard to accept. I believe a lot of Democrats, and I know a few, were so enraged that Obama did not investigate Bush et al, that they could not get over it in eight years, so they stayed home, or went for the stupid "I will punish the Democrats and vote for trump" thing. Biden needs to allow investigations to go on, he may not need to get involved, but he must not get in the middle, he needs to allow it to run its course.
This has nothing to do with the color of your skin, this is about how masses react to injustice. Not sure how you got on the race train with what Freud wrote.