Split-second decisions are exactly what is often needed to save lives, as humans have demonstrated for decades now.
Demonstrated the ability to kill tens of thousands of people every year because of the human inability to consistently make split second decisions? I think is what you mean. We have a well known and well studied problem that is almost completely unsolvable without autonomous driving. Finding issues is fine, but there are a hundred people dying every day who's families can't wait for widespread adoption of autonomous driving.
This technology will save lives and we need it yesterday.
Yes, I'm well aware of the problem we're trying to solve here, but an obituary that reads "killed by autonomous bug #285A" isn't going to make any family member feel better vs one that reads "killed by a drunk driver". In fact, it's likely going to make them even more angry because their loved one that was sober, alert, and attentive behind the wheel was killed by their own damn car through no fault of their own.
Yes, the thousands of people dying every year is something that we do need to address yesterday. Are we there yet with autonomous tech? Not even close.
And for all the humans who might not make that split-second decision fast enough, I'm certain there are plenty of examples of humans who did, and saved lives.