I'll take the other view. The idea that a Supreme Court appointment could be delayed or denied on account of an anonymous allegation of sexual misconduct between two minors that took place more than 30 years ago is absurd. If a crime was committed it should have been reported. It's likely that no civil or criminal action could happen due to a statute of limitations in the state in which the alleged incident took place. This would be another case of "me too" taken to an extreme, where the defendant has no means by which to defend himself.
What the democrats probably want to do is continue to delay the confirmation process, preferably all the way until the next election cycle, and see if they can buy some time to win a few more seats in either house of Congress. In the meantime, they're reaching to cast aspersions on a judge who by all accounts has a long and solid record of service.