The algorithm has been designed to ignore stationary objects because the algorithm and associated hardware is incapable of determining which stationary objects are actually in the path of the vehicle. Regardless of whether the car slammed on the brakes or blared a klaxon there are so many false positives that to do otherwise would make it useless.

So of course the only sensible thing to do is release a product that happily accelerates into the back of a bright red emergency vehicle with flashing lights. Or into a stationary concrete barrier. Or into the side of a massive tractor-trailer.

I mean, who wants to bother with false positives?