Following bad directions can of course potentially get you killed (which is why you shouldn't blindly follow them). However, there are other navigation software providers out there, so if Google suddenly disappeared, people would be able to switch to those. If those alternatives give bad directions and get people killed, that's not Google's fault.
(And, death aside - if I could - I just want to bring up that it does not necesarily have to get to life and death to be dysfunctional or dangerous or inaceptable ...)
It would be unfortunate if YouTube and Google Maps broke down and became unusable, of course, but no one's going to get killed by it.