Walking past a small playground one day, you see two young children engaged in a serious-looking fight. No other adults are around. How do you respond (if at all)?
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A fight between children is difficult to ignore -- you know it's not really your business, but still, the urge to intervene is strong. Something about the situation seems to invite the voice of reason to speak out and set things right. The same could be said of illicit love affairs between adults. The way you responded to the fighting kids shows the way you might respond if you learned that a friend was having an adulterous affair.