I would think that verifying the validity of the data would be one of the first things they would do in a study such as this.
This question would most likely be proposed in any aircraft crash situation as well when the black box is checked.
If this study is right - it sounds almost like a bandwagon effect where everyone was trying to get out of higher insurance premiums, out of fault from an accident they potentially caused, etc.
It's a lot easier to say "It wasn't me, it was my Toyota!" than "My bad, it was my fault. I'll take responsibility for pulling out in front of you."