I think everyone including Biden should have the presumption of innocence absent strong evidence. That doesn’t mean that I believe Biden. In fact I am pretty sure he is guilty because of his long history of such conduct.
In a fair world, that is the way it should be. However, we are talking about the world Joe Biden helped to create. He brought Anita Hill out and out put her on national TV to "lynch" Clarence Thomas because he did not have the guts to vote "no" against confirming a black man to the SCOTUS. He came out strong on "believing women" when it was Kavanaugh in the spotlight. I don't know if she is telling the truth, nor do I care. I just like to see libs hoist with their own petard. What goes around comes around.
Except Biden is running for elections. As a private citizen he has presumption of innocence, but as a running politician pleading to people, he has a certain amount of burden of proof, much like he would in a wrongful death or tort civil suit.
The problem is, he seems to be preventing any search into his congressional papers that could turn up the evidence.