It's fault of the person who didn't have enough room to stop. Full stop.

It doesn't change the fact though that human drivers don't slam the brakes out of the blue because their "AI" got confused about nothing in particular, and that it is dangerous.

A lot of drivers tend to drive like assholes so this isn't too surprising.

Slamming brakes for not reason IS being complete jackass. And if you do it frequently enough, you have no business being on road.

You are conflating “unexpectedly” with “no reason”. The parent comments said “unexpectedly.”

There is a world of difference in those word choices. Saying “no reason” certainly gives you an excuse to write a sanctimonious comment like this, but it’s misrepresenting what was said.