I'm chiming in a bit because I sometimes get this from the AMV side: "What do you mean,
Last Airbender isn't an anime?"
(The AMV rules have a 10% cap for non Japanese origin.)
A few years ago the AMV judges panel bounced an video made from
Shin Angyo Onshi because it was Korean animation and not Japanese.
This particular convention has defined itself as having a center interest in Japnese animation, gaming, history, and culture, with possible (but not mandatory) peripheral interests in other Asian cultures. Coming to this anime convention is a voluntary interest. Also, a club focusing on traditional cooking from a cultural region need never acknowledge other regions and cultures, and that's not an insult to those other peoples or cuisines.
Is this 'unjust?' No, because 'justice' involves
getting what you deserve - whether it could be suing for wages you earned (and deserve) but your crooked boss is refusing to pay, or it could a judge handing down a civil penalty such as a fine you must pay,
because you deserve 'a lesson.'Now what if some people wanted to practice Japanese and decided to meet monthly at a coffeehouse and try out their conversational skills. Are they 'better' than the Lithuanians who meet elsewhere monthly to practice Lithuanian? No. But if the bunch of people who want to try out their Japanese were meeting and someone else says 'Hey, how come none of you are interested in speaking Korean?' that might feel a bit obnoxious. 'But I learned Korean - don't I
deserve some recognition from you?' No, you don't. Korean speakers may appreciate it, but even they don't necessarily
owe you recognition, either.
Next, not every special interest organization
needs to broaden its interest as it grows.
Here's a growing club ONLY for people 6'2" or taller:
http://www.tall.org/about_tci.cfm?CFID=1052100&CFTOKEN=87126656Are they being
unfair to me because at 5'8" I could never join them?
Don't I 'deserve' something from them? Answer: No.
Why do they get together and exclude people like me? Possibly because they have certain common interests - including costuming. Tall people certainly might be interested in sharing sources for clothing that fit them, special alterations, or fashion tips that work for them but would look uber-dorky on ME if I tried it...
As organizations repeat their events, a
tradition gets built up, and that can be a source of pride, interest, and dedication. "We're
not really interested in [Y] because we've always been interested in [Z]" is a valid definition for a group. Narrow focus isn't always a bad thing - there's an internet forum devoted to the
Gewehr 43 - a very specific collector's item. Oh wait, they've
broadened to include the Karabiner 43, and some folks even talk about the older 1898-style Mausers (G98) and their carbine rifles (K98.) But they're so narrow-minded, it's all about the 7.92x57mm JS - when will they ever learn that the world has moved on to the 7.62x51mm NATO round?
Fun: I remember at Sakuracon 2003, seeing a member point to a cosplayer and tell her friend "Hey, that's a
game character costume - this is an
anime convention!"