The Cosby case is irrelevant. It's a completely different legal system. Most of the accusations could not be tested in court at all as they had exceeded the statute of limitations. It's a jury system. It's a different, 300 years older, constitution with fewer rights than ours (including fewer rights of the accused). There were dozens of accusers, not just one. The cases have nothing in common.
Even so, Americans have a right to think he is probably guilty and most Americans do.