This article is from the Science Fiction Fandom FAQ, by Vicki Rosenzweig vr@panix.com with numerous contributions by others.
Because people are lazy. Given the chatty nature of this
newsgroup, topic drift is a way of life. And it's easier to just
hit "reply" than to edit the subject line to say "Tom Godwin's Law
(was Re: Nazi Space Pilots)."
 
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