I can't speak for anyone else, but I tried to always add the disclaimer that the filing might simply be incorrect, in which case it needed to be refiled. I didn't care if he sold or not, I just wanted the public information to be accurate.
That's the entire point of the public disclosures, investors should be able to find out whether the only insider sold all of his shares or not. I believed the email you mentioned, but what was the date on the email again? How many weeks did it take to fix a single line in a table?