Forbidden to believe a single allegation? Did you really say that? That is one of the most foolish statements in this thread. You may referring to a completely mistaken understanding of the obligation to be ?? ??? ????, which actually does not obligate anyone to deny facts, but to be ready to accept alternative explanations. Since we are talking facts, the role of the jury is to establish facts by believability. This requires a “jury of one’s peers”, not experts. It is correct that the Torah does not account for a trial by jury, but that is the secular court who set the rules for that system. It is bizarre to expect a secular court to adopt the standards of a beis din and halacha to adjudicate a criminal.
As for benefit of doubt, NW already got that. Now it’s time to put him away. Next?