I don't understand why due process and burden of proof are relevant regarding the Kavanaugh proceedings. He was not before a court being charged with a crime. This was supposed to be a job interview or at least that is what it ought to have been . If I am interviewing a person for a job in my company, and I obtain information that the person was alleged to have stolen from his last employee, but was never convicted or charged with a crime, and I have no other collaborating evidence that would validate that he was a thief, and the individual denies that he committed the crime.
In such situation, I am not obliged to afford that person with any presumption that he did not steal from his former employer. Likewise, I am not obliged to conduct an inquiry of this matter in which the person is afforded due process.
However, even assuming that Kavanaugh committed the sexual assault that Ford has accused him of, I don't see how what he did as a teenager, some thirty five years ago, has much if any bearing on how he would conduct himself going forward as a Supreme Court Justice. Moreover, given his exemplary treatment of women in his court room and in his professional life over the last thirty five years, I also don't see that this has has much, if any, bearing on what his current character is.