My honest opinion here is that almost everyone is completely missing a crucial point. Nearly all of the reasons given for locking people out of modifying their cars apply equally to cars without computers. Changing the odometer? It's far easier to do that on a car with a mechanical odometer. Making the vehicle non-emissions compliant? Nobody used the DMCA to argue that people shouldn't be allowed to remove their catalytic converters. All of this has been fought for far longer than computers have existed. People have been successfully fooled into thinking that this is a new situation, when technology is only being used to prop up an ancient ideology. Very frustrating indeed!