"There is a tradition in many Usenet newsgroups that once such a comparison is made, the thread in which the comment was posted is over and whoever mentioned the Nazis has automatically lost whatever debate was in progress."
Tim continues:
"In case your head has been buried in the sand for the last sixty
years or so, the Nazis were a German political party lead by Adolf Hitler
that slaughtered upwards of ten million people that didn't meet their
standards of "ethnic purity" and set off to conquer Europe and the world
in World War II. They are generally considered the most evil group of
people to live in modern times, and to compare something or someone to
them is usually considered the gravest insult imaginable.
As a Usenet discussion gets longer it tends to get more heated; as
more heat enters the discussion, tensions get higher and people start to
insult each other over anything they can think of. Godwin's Law merely
notes that, eventually, those tensions eventually cause someone to find
the worst insults that come to mind - which will almost always include a
Nazi comparison.
The Law is generally used on Usenet as an indicator of whether a
thread has gone on too long, who's playing fair and who's just slinging
mud, and who finally gets to "win" the discussion. It has, over time,
become the closest thing to an impartial moderator that Usenet can get."