Because most Tesla drivers are not pilots.
The GreatUnwashed think that autopilot is exactly what it says on the tin.
As a side-note, not a single one of my pilot friends wants anything to do with this technology ... and most of them (including myself) think it has no place on the roads, and should be banned. It's not ready for prime-time, and quite possibly never will be as long as there are actual humans allowed to drive on the same roads.
