My understanding is the supposed unintended acceleration problem really was not a problem with the cars, but with the drivers.
Let's remember that the big incident which brought focus onto Toyota was a policeman who supposedly could not keep his vehicle from accelerating out of control on the highway, and crashed, killing his family.
How is a policeman not an experienced, calm driver who knows that you can simply shift he car out of gear while maintaining power for the steering and brakes? Answer: the policeman was either a suicidal maniac, or looking for a TV interview and a settlement check. Whichever the case, he and his family paid for it with their lives, and Toyota paid for it with millions of dollars sunk into analyses and investigations which revealed that there was no problem with the cars. If you think there was a big cover-up and there really was something wrong with the cars, then you can introduce the third possibility, that the policeman was just an idiot and didn't know how to operate his car. However, the evidence indicates the drivers were at fault for all of these incidents.