Corollary to Godwin's Law which states that the only people who complain about Godwin's Law being invoked are those that often make Nazi References.
Bob: America is like Nazi Germany and Bush is Like Hitler
Sally: I invoke Godwin's Law! You hereby forfeit the discussion.
Bob: Gah. Godwin's Law is just an escape for people who don't want to admit the truth!
Sally: Simpson's Corollary! Only people who make Nazi references all the time complain about being shut down by Godwin's Law.