And here that's not the case: a grandpa in a class S killed 5 workers on a french highway some time ago. Cars full of gadgets assisting people who should never have been driving or who shouldn't be driving anymore are only going to give these a false sense of security.
Also : when you brake you always must take into account what's going behind you, not just what's in front. Sometimes it's better to hit the car in front of you to give a little more room to the semi coming behind that is otherwise going to ruin your Class S and your life. How does a car applying stronger braking when you didn't brake enough to its taste deals with that?
Just as user 'bambax' wrote: a fully automated car with no driver would be great (but we probably won't have it widely deployed before a few decades) but a car trying to 'tell me how to drive' is not that great of an idea.
With all these gizmos starting to widely appear in cars I'm pretty sure that soon the Wikipedia list of computer bugs that ruined human lives is going to get way longer...