Ms. Quinn said she supports the legislation in concept but believes, given the state of the economy, it will cause more harm than good.

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Just last week, Ms. Quinn said she supported the legislation in concept but believed, given the state of the economy, it would cause more harm than good.

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Over time, as driverless cars dramatically reduce human error (which is the No. 1 cause of accidents) and more people accept the concept of shared cars, the possible car designs will explode.

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But a veto of all these missions, involving everyone's personnel, not just Americans, could cause real problems in many countries, and would cast a shadow over the entire concept of international peacekeeping.

ECONOMIST: Tipping the scales of justice | The