It does not absolve the other person from responsibility for not following the required safety protocol. The car in front of them might have had to brake for a perfectly legitimate reason.
I mean, suppose that the other driver was driving while drunk. They might have arrived to their destination safely without the asshole in front, but that's not an excuse against a DUI ticket.
In the actual case with Tesla, the driver of the car that was in front of the pile-up was not at fault IMO. But there were a bunch more cars behind, and at least some of those slammed into each other because they didn't maintain proper distance, according to the police.
This seems to be 100% the fault of Tesla for selling unsafe equipment. Some amount of blame for the Tesla driver. 0% blame for the car that got cut off and hit the Tesla. And 100% blame for every car behind that crashed into the car in front of them.
Simply, drivers don't use their common sense, and just their normal daily driving routine is already endangering to people around.
Maintaining a safe configuration of cars on the road is the collective job of everyone who is driving on it; and conversely, it takes just one person to ruin it for everybody who is doing the right thing. So it really needs to be a part of the culture of driving for that to work. And we don't have that in US, unfortunately (though, to be fair, there are far worse places to drive in).
