One reason I remain staunchly opposed to the practice of publishing one’s fanfic without credit to the original author (which, by the way, happens automatically in the case of publishing a fanwork of an out-of-copyright source–by keeping Mr. Darcy as Mr. Darcy, you implicitly acknowledge your debt to Austen in the creation of the character) is because I still have never seen an answer to this central paradox that doesn’t rely on “Well, I just didn’t know any better” as the crux of the defense.
And as we are largely a community of adults, and since I don’t know of a soul under the age of 18 who has P2Ped, I find “I didn’t know any better” to be a lame excuse.
So here is the paradox.