Here's a video report from last week, showing how crash avoidance works, and that auto break simply fails to work in some vehicles. And yes, the feature does work in other vehicles, as they should in such easy scenarios.
The problem is, you have cars marketed and sold as having these features that simply do not work. And it's clear that drivers who own vehicles with all these magical features get lulled into believing they don't have to pay attention 100% of the time and at a moment's notice.