>I don't think that there is any precedent for that sort of thing with manually driven cars.
A stroke or heart attack while driving?
A stroke or heart attack while driving?
A "Perfect Storm" of bugs could cause a systemic failure that has the possibility to affect all cars everywhere (well, probably limited to a single car-maker / model / etc). This has the possibility to affect millions. Claiming that a stroke or heart attack while driving has the possibility of a similar scope / reach doesn't make sense.
So in that respect, the introduction of self-driving-cars won't necessarily make such events more likely.