To be fair, immobilizers were standard at the time. Every manufacturer was already using them because using an immobilizer is just common sense. So making a law requiring them to use immobilizers would be like making a law requiring people to wipe their asses. It would have just been seen as useless because everyone is already doing it and who in their right mind would suddenly just stop wiping their ass. It's only fairly recently that kia and huandai have suddenly lost their minds and decided to walk around with shit covered asses. Also from what I've seen every judge that has looked at the issue is already ruling against them because not including an imobilizer is so willfully stupid that it's gross negligence.