Respectfully, I think this amounts to bias more than anything. It's a lot easier to believe that the slide-offs are caused by bad driving - and most probably are. But some are unavoidable.
I'm not sure how a self-driving car would have fixed that. I certainly believe one could but it would require a ton of learning beforehand and conditions vary widely in storms. I suppose with all-wheel drive and some selective application of the wheels in reverse it might have stopped the car before any damage was done, but how to handle situations where the AI can't stop the car before an incident and has to minimize the damage? That feels like a lawsuit waiting to happen in the US.