Note that the Tesla changed lanes, into the passing lane no less, and then immediately slowed down significantly.
So the first car to hit it may have had a very safe distance between it in the next car, but the Tesla cut that significantly with its sudden maneuver.
It's a popular opinion but I think it's wrong. If they weren't all so close together some of that could habe been avoided. The Tesla indicated for a very long time telling other what it's gonna do.