This isn't an honest test. Think through the reality and then mimic that - but the reality isn't a child standing still in the middle of the road in the middle of the night.
Also, Tesla requires you pay attention still - which is relying on it, but they tell you NOT to rely on it 100%, so in this demo the driver is at fault for not watching ahead of them and breaking. So your claim that they're awful at stopping is pretty disconnected.
Even if you are paying attention, wouldn’t there be an inherent delay between passively paying attention and taking over a self-driving car? I don’t have any evidence but it seems like it’s inevitable. Furthermore, by design, even attentive, well-intentioned drivers are more likely to be distracted or under estimate risks if the car is doing the driving 99% of the time. The ‘well technically it wouldn’t have murdered that clearly visible child if you were paying attention’ defence is both specious and obviates a lot of the value of teslas autonomous driving tech.
I won’t argue there aren’t some inherent benefits of even basic driver aids, but if you pay have to pay 100% attention 100% of the time, the tech loses it’s lustre. This is a problem largely of Tesla’s own making IMO — their marketing and Elon’s public statements paint a much, much rosier picture and people buy into it.
Also, Tesla requires you pay attention still - which is relying on it, but they tell you NOT to rely on it 100%, so in this demo the driver is at fault for not watching ahead of them and breaking. So your claim that they're awful at stopping is pretty disconnected.