The fallacy of constructing an argument within a UniverseOfDiscourse, that excludes all evidence against it.
It is just too easy for a religion or ideology with a sufficiently complicated UniverseOfDiscourse to fall into this trap (on the other hand, it might be no trap, but rather a useful device to keep out opposing ideas).
This fallacy can take the form:
In other words - "<foobar> is flawless. Bad <foobar> is really <barfoo> - so don't criticize anything about <foobar>, since you erred by doing <barfoo>."
General example: ConspiracyTheories
This is an extreme special case of a MentalFixedPoint.
A reference that is based somewhat on this fallacy:
Wie man mit Fundamentalisten diskutiert, ohne den Verstand zu verlieren: Anleitung zum subversiven Denken, Hubert Schleichert, C. H. Beck, 1999, ISBN 3406511244 .
"How to discuss with fundamentalists without losing your mind. An introduction to subversive thinking." - The translation of the title is a good description of this little booklet. Very good reading. If somewhat cynical, this book is a perfect guide to dealing with nasty politics without falling into the trap of using it. German language only.
Related to TautologicalDefinitionFallacy, NoTrueScotsman and GrandConspiracy, IfYouDontLikeItYouDontUnderstandIt.
See also EvilOrStupid, ReligionOrCult?