technology
"Current technology has limited the pilot's responsibilities to entering and validating the route, taxiing to the runway, monitoring the flight path, and being "available" to assist on take off and landing. The majority of new aircraft can handle all these tasks with no human intervention. "
I assume that you read this somewhere and have never flown an airplane. I have flown them all - fighters, trainers, cargo, passenger, domestic, international, land and sea, modern and old. Informed decisions have to be made on every flight.
Pilot error accidents do occur, but it is the principal cause, not the only cause. Any accident expert will tell you that accidents have no single reason; they are the end of a chain of events.