I'm pretty sure people would be after blood from most companies if the rape occurred on company time and company premises.

(Yes I know the cab isn't owned by Uber, but the analogy fits)

The question is, for any taxi service, how many rapes we define as acceptable before we start insisting on specific, effective measures to improve safety. It cannot be axiomatic that it is not fair to ask Uber ever to do anything to make their service safer.