Getting to that point is the challenge. I'm just throwing out questions and raising the point that there are some very very hard challenges to solve, where humans are probably much better.

There is a type of trolling - the concern troll - where a person just asks questions.

There's a risk that you look like a concern troll or like someone with a superficial understanding of the topic or someone with vested interests in competing technology.

Concern trolling has a long history in, for example, big tobacco campaigns.

I don't believe you are trolling and I didn't downvote you. I am giving a possible explanation for downvotes.

You should try to be more specific. What are the hard challenges that remain? Where are humans better? If it's bad weather driving, for example, perhaps humans would drive in those instances.

30,000 deaths a year in a country like the US is nothing. More people die from falling down the stairs. Should we ban stairs next?

Your statement is factually incorrect according to official statistics,[1] which I found through a very easy Google search after reading your comment. (Note that the statistic shown is for all accidental falls, not just falls on stairways, and even in the aggregate all falls cause fewer deaths than car crashes.)

[1] http://www.cdc.gov/nchs/fastats/acc-inj.htm

He's way off. About 1300 people die from falling down stairs every year.

http://danger.mongabay.com/injury_death.htm

So, if we reduced auto deaths to 1300 by using self-driving cars, that would be acceptable?

Pretty comparable - 26,000 accidental falls, 30,000 car deaths.

You said "fall down the stairs", which I addressed hours ago. Also, you aren't accounting for the hundreds of thousands of people injured and the millions of dollars of damage.