With apologies to Mr. Thoreau, I don’t honestly believe that the great mass of humanity lead lives of quiet desperation. Most people, I have come to think, live lives of simple routine, blended with dollops of making-it-up-as-you-go-along. They come to crossroads in their lives and turn one way or the other not because they’re desperate and not because they’re dazzled by a sunbeam highlighting a particular path. They choose a direction based on whatever information and other resources they’ve got available right then. Only in hindsight does it become “obvious” that they had to go straight, or left, or in sudden reverse, or whatever.
But fictional characters: ah, yes, things are a bit different with them. They plod along, unaware they’ve been ascending a ramp rather than a simple road, and suddenly they realize they’re at a fulcrum. The course of their lives hasn’t been up a mountainside to a peak. It’s been up a see-saw: to take one step further will throw them off-balance, if not dump them entirely (as Dad used to say) ass-over-teakettle.