It never occurred to you that somebody would "blindly" (what does that mean in this context?) follow a dotted line drawn on Google Maps? That's pretty unreasonable, to put it lightly. Blaming users for the consequences of bad UI is a huge problem in software.
But I’m also confused that people will blindly follow turn-by-turn road directions too. Even when road signs disagree, even past road closed signs, even on gravel roads right before the first snowfall. People assume the computer knows the map and that the map is the territory. Yes, it’s terrible UI, but people don’t ask themselves if they interpret it wrong. At least you can fix the map; not sure how to fix the blind trust in humans.