Should banned user mods/maps/etc be deleted from these boards?

[LDiCesare]

Originally Posted by Muse

Authors do not have the right to 'delete' their work from the public domain, whether or not a library they dislike profits from it.

Depends on your country.
In France they definitely can. Except for software for some reason. The code de la propriété intellectuelle goes so far that there are some rights that cannot be legally transferred (moral rights), and these include the right to no longer allow publication of one's work.

Art. L. 121-4. Nonobstant la cession de son droit d'exploitation, l'auteur, même postérieurement Ã* la publication de son oeuvre, jouit d'un droit de repentir ou de retrait vis-Ã*-vis du cessionnaire. (...)

So basically anything written in France cannot be published without the author consent, even if there was a paid contract for that. Problem being the paid contract being broken, the author will have to pay an indemnity to the publisher if he wants to stop the publication, and he has to give this same publisher priority should he allow publication og his works again...