From a PR standpoint, how is it advantageous to Tesla for laypersons to be told that Autopilot, which is ostensibly safe enough for hands-off highway driving, can't recognize what is to every human driver an unambiguously dangerous situation?

In terms of overpasses being falsely identified as the broadside of a truck, this explanation feels more and more confusing to me as Tesla doubles down on vision-only self-driving (as opposed to LIDAR-assisted). Why would a camera and computer-vision algorithm ever falsely identify an overpass, which in normal weather is viewable and trackable from at least a mile away, as a broadside of a truck suddenly running through an intersection?