Actually they might, i have just seen a few videos in the past, where it was said that sadly the video cut off early because someone honked the horn.I thought they fixed that a while back where the recording now does a larger portion before and after the horn press?
I would agree, that sometimes you honk the horn to alert someone possibly in the process of merging close in front or into your side, and it would be nice if it saved maybe 20 seconds after, just to be safe.
I mean, if you honk and they did not react and still hit you, the action would be after the honk.
But...Maybe it was fixed at a later date, compared to when those videos were made.