I see this complaint frequently, and I find it confusing. The feature is clearly named after the 'autopilot' found on airliners, a system which is designed to do things like maintain heading, manage airspeed, and avoid collisions. Airliner autopilot should not be relied upon for every step of a flight without human oversight, but clearly an airliner with autopilot is safer than one without. And if a pilot engaged autopilot and stretched out for a nap, we wouldn't blame autopilot for any resulting catastrophe.
So, how is Tesla's autopilot meaningfully different from that? They don't call it 'self-driving', 'autonomous', or 'driverless', they've named it after a very similar existing technology.
Tesla deserves a lot of criticism, but this specific complaint strikes me as misplaced.