Only half of the subsequent impacts in the Tesla video are the fault of the car who hit the car in front of them. I agree with the police conclusion that vehicles 5, 7, and 8 share fault for unsafe following. Vehicles 2, 3, and 6 do not, despite crashing into the car in front of them (subsequent to being hit from behind). Vehicle 4 I couldn’t develop a clear sense of what happened, but it seems was hit only from behind.