Because about 100 years ago, the auto industry responded to a surge in murder by the new automobiles by forming auto associations and using those to change loca

Because about 100 years ago, the auto industry responded to a surge in murder by the new automobiles by forming auto associations and using those to change local laws to outlaw behaviors leading the victims to die. Like the newly-minted term "jay walking." And over several generations that became such a firm part of the status quo that we can't even imagine it some other way. Compare with electricity, a danger that Edison terrified everyone into enshrouding in standard safety features to protect the public. Both were set in place by a popular sentiment driven by industry manipulation. That's why. Next question.