My dad had a rule  "One 'awe shit' wipes out a thousand 'attaboys'."  Joe's awe shit moment was pretty huge.  There are good people that fuck up enormously all the time, and that's what people remember, whether it's right or wrong.   I sort of buy in to K's theory too...easy to judge from afar, can't know what you'd do in another's shoes until you're there.