First, it's hard to be optimistic, because the brain's filtering architecture is pessimistic by design. Second, good news is drowned out, because it'… - Peter Diamandis

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First, it's hard to be optimistic, because the brain's filtering architecture is pessimistic by design. Second, good news is drowned out, because it's in the media's best interest to overemphasize the bad. Third, scientists have recently discovered an even bigger cost: it's not just that these survival instincts make us believe that "the hole we're in is too deep to climb out of," but they also limit our desire to climb out of that hole.