None of that relates to whether or not we should uniformly believe every person who alleges a crime until such time as an investigation into it proves that we should not. Under American law, a credible accusation is considered evidence.
What Counts As Evidence?
The US judicial system is very clear even if it doesn’t always apply it to powerful, white men.
“In a court of law, a judge or jury who believes that a witness is telling the truth can convict someone of a crime even without corroborating evidence. This happens all the time.”