I don’t think it’s helpful or even correct to say “people are dumb,” as if this is purely a user problem.
The system exists in a bad gray zone — one that works well enough most of the time you stop paying attention. But it’s not full proof, so you get the worst of cognitive bias here.
Personally I think this faux self driving (literally falsely named auto pilot) should be outlawed. We cannot depend on people to take over when the car generally is handling the situation most of the time. Either manual or fully automatic — this in between will continue to cause too many bad accidents.