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However should we ban all stamps that convey the wrong message? Should we burn all the Hitler stamps or those that have anything related to the Nazi's? To tell the truth I don't see why the Allies didn't destroy all of these after the war.
As far as I know, large amounts of nazi-memorabilia (everything from badges to stamps) was looted by allied soldiers on both sites. The largest collections of that material are still in the US and Russia.
Nazi-related material is still very popular among collectors. You do not want to know how much is paid for original uniforms - and how many forgeries are on the market...
But returning to the original subject of this topic: I do not see why any stamp officially issued for postage should not be listed. And what would your criteria be? Mkfarm already pointed to the Hitler stamps. There is always someone offended: vegetarians do not like stamps about meat, religious people might be offended by stamps about Darwin... the list would be endless and a catalogue useless.
A catalogue lists all stamps issued, it does not judge them on moral, esthetic or other quality.