Imagine a ship with 100 passengers and crew drifting down a river that eventually cascades over a 1,000 foot waterfall. It's easy to plot the ship's course and the waterfall ahead. You might think 100% of those onboard would agree that something drastic must be done to either reverse course or abandon ship, but before we jump to any conclusion we must first identify what each of the 100 people perceive as serving their self-interest.
If life onboard is good for 60 of the 100, they may well rationalize away the waterfall dead ahead. Why risk the treacherous river currents by abandoning ship? As a result, the majority vote to tweak the ship's course slightly, thus dooming the 40 others who can hear the thundering cascade ahead but who are powerless to change course in a democracy.
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