Because getting out on the road with thousands of totally untrained idiots who are texting, talking, eating, changing CDs, falling asleep, drunk, high, etc., is such a naturally safe activity to begin with.
Please. The more automation, even in baby steps, that can be deployed quickly the better and safer every mile of roadway will get.
I'll trust this, sight unseen, a whole lot more than I trust you, or your wife, or your 16 y.o., behind the wheel.