Here's at least one probably fatal crash completely saved by Tesla autopilot,
in a situation exactly like that of the fatality with the exception of the car being something AP is designed to sense versus something it is not designed to sense.
It doesn't matter that one person died in autopilot;
it is most likely given current statistical information that far, far, far, FAR safer than having humans operating in conditions it is meant to operate under.
I don't understand your mentality in the slightest bit. Not one bit. Seatbelts are not 100% effective, but because fewer people die with seatbelts we use them. Airbags are not 100% effective, but because fewer people die with airbags we use them (even though airbags can explode and KILL passengers when they malfunction). Autopilot is not 100% effective, but because fewer people, but it most likely is--and will soon be proven to be--far safer than not using it.
Driver assist features do not have to be 100% safe to use, they just have to be
safer than humans which is INCREDIBLY easy to do.