Maybe Tesla should word the disclaimer stronger with a more clear language such as "AP is currently in the experimental (a.ka. "Beta" stage). When using AP, the car WILL DO THINGS WHICH WILL RESULT IN AN ACCIDENT AND POSSIBLY DEATHS IF YOU DON'T TAKE OVER. It might do it once a week, it might do it once a year, or once a decade, but it will at some point kill you if you don't intervene, so you agree to be vigilant and have full situational awareness at all times when using this feature and be ready to take over at any time without any notice from the car. By using this feature you agree to assume all all liability for anything the car does whether AP is enabled or not, even if the AP action breaks traffic laws or does something completely irrational such as impale the car into a median, or drive into oncoming traffic, etc".
Have people read the more direct language, acknowledge they understand, then sign with a notary present - no more problems with lawsuits.