Humans are not capable of suddenly be required to take control of a vehicle with a split second notice.
Hopefully the laws mature enough to prevent these for being road legal.
But Tesla doesn’t seem to push this specific use-case resticted angle of it, Musk is focus on full self driving.
If they were serious about full self driving there wouldn't be any reason to bother with autopilot.
Do you think a level 4/5 system would be done already if they hadn't made a level 2?
You can have automatic braking without having such an unsafe system.
Other brands do...
It isn't ethical, not that I expect them to care. But I don't think a sane company would play so loosely with peoples lives when they are fully dependent on complete trust when they launch something with full automation.