Earlier quoted context omitted.
"Rather than autonomous cars, we should be focusing on Taleb's antifragile solutions like walking and biking." Let me guess: you're in your 20s-30s and in perfect health, that you live in an urban environment, and that you don't have a family to shop for.
Walking and biking infrastructure and livable/walkable cities/neighborhoods are key pieces to health from youth into old age. Just because it doesn't now exist in the United States doesn't it mean it can't or should not.
Increase the population of the U.S. to a billion or so, then maybe it will work.