If that's true, which it may well be in that case, I'd say that Uber is an exception to the rule and the HR department was simply run in a (frankly) idiotic and irrational manner.
HR departments are intended to protect the company from liability. Generally speaking, they do that by taking standardized actions regarding harassment claims because otherwise they open the company up to lawsuits and negative PR. (see Uber)
Most company HR departments take harassment VERY seriously for this reason, especially if the harassment was written in black and white, such as Susan Fowler claims her harassment was.