[ [ [ bloggin space w i k i ] ] ]The Hindsight Fallacy
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Hindsight is 20/20... Gosh, I sure don't like that idiom. When uttered, that stupid phrase assumes far too much. It does not account for opinions, past experiences, or unreliable narrators.
Eyesight
When you have good eyesite, it is often described as 20/20 vision:
“A person with 20/20 vision can see what an average individual can see on an eye chart when they are standing 20 feet away,” - Dr. McKinney, ophthalmologis[1] 
But when people tell you "hindsight is 20/20" they just blurt it out as if everybody has perfect, unsullied memory of an event. Then, because somebody uttered that phrase, everybody just nods and agrees.