They can be accused of a crash even if there isn't a crash though. And if they have no data to back up their side of the story, why would any court believe them? In other words - people can just randomly accuse them of hit-and-runs and they'd have nothing to say otherwise.
I don't see how it's any different from accusing random people of a hit and run.
Though enough data to disprove a hit and run wouldn't actually take up very much space. Medium-resolution camera views and some acceleration data? Sure, pop a single SSD in there and it'll hold more than a month's logs.
