[throwaway0a5e]

You are misrepresenting the capability of AEB.

AEB will prevent you from rear ending someone at <10mph in stop and go conditions and knocks 5-20mph (being really generous on that upper bound) off the contact speed for higher speed rear endings (that most people won't ever get in over a lifetime).

It mostly does not prevent the kinds of accidents where people get injured (save me the anecdote about how your brother's roomate's uncle backed his semi into the loading dock a little too hard and hurt had a sore neck the next day).

Don't get me wrong, for what it does it works, but it is not the magic want the internet tends to act like it is. you have to weigh the potential improvement against the price of a new car.