Alerting driver of potential pedestrian = good
Automatically making a decision (that the human is better at making) and potentially causing an accident due to a random sudden stop = bad
Automatically making a decision (that the human is better at making) and potentially causing an accident due to a random sudden stop = bad
Incidentally, heavy breaking reduces a car's ability to corner which may end up causing accidents which could otherwise be avoided.
What about when the car really is better at making that decision? IMHO, we are few scarce decades away from cars that will just be plain better drivers than the median meatbag.
...except that we've been a few scarce decades away from this for a few decades now. For the most part the history of this thought process is that we dramatically underestimate the problems involved.