There are two buttons. One button kills a child who sits in the next room. The other button magically sets the maximum legal (and enforced) speed limit to 45mph (72 km/h) across the globe. You press the button which:
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45mph in urban areas (urban areas being part of "the globe") would mean a lot more dead children given that round my way it's 20mph or 30 mph. Difficult choice.
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