no doubt about that, thats just common sense.
but in the specific case of ricciardo-vettel (and in a way motegi 07 with web ham vet) i would definately say its at least 60% the fault of the driver that hits the brakes.
i'm all for keeping a distance and drive responsibly but when somebody hits the brakes hard out of the blue its near impossible to avoid a collision.
i guess my point is just that we have to differentiate between brake checked induced incidents and all other examples of running into the back of another driver (where i 100% agree that its always your duty to make sure you can avoid the other guy given he drives responsibly..shame you weren't here in 05 and 08 where i could have provided a nice contrasting incident compared to being brake checked
)