Maybe NASA still wants to get something for the money spent launching Crew 9 and get some science done, not just be a rescue mission. They don't want to cut that mission short.
Sure, if Starliner returns in auto mode successfully, then Boeing will be able to save face, and NASA will be able to take some stock in that. However, if there is a viable alternate option that has a much better track record of working, NASA would potentially not survive as an agency if there was a catastrophic ending to a Starliner return with the astronauts on board.
So from a keep humans safe while still attempting to complete the Starliner mission as much as possible, to me this is the best solution. In fact, it's kind of bonus for Boeing to test the automated return that was not part of the original mission. </spinDocter>
