Oh, I completely agree. I think the default should always be to side with the victim, even if there's a good reason to doubt them.
I just think we sometimes go too far and ignore the other side when it doesn't line up with what the victim says. Weigh the evidence and the motives of each party before making a decision. The bigger the power difference between the two, the more you should suspect the larger party of malice.
I'm more reacting to the strength of the language here, not the general idea.