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in a nutshell, bronies as we know today are the kind of kids or older kids who are like anonymous ledjun, or meme spewing machines. because it appeared on 4chan they decided to fall for it.
they don't watch the show, they don't care about it, they don't even know what is /co/ or /b/, for most they are ex-sonic fans who decided to jump on the next bandwagon. that's about it; there's nothing more to understand or analyze, it's in fact very simple.
the big picture? we no longer have a culture of our own, thanks to consumerism and globalist ideology. this generation barely have a personality, it's formatted by political discourses and TV shows.
culture looks too old and not cool enough, or too intellectual for the masses, so people get a label and jump on some of these subcultures, trying hard to fit with it, like a way to get themselves an identity, a lifestyle, a personality even.
MLPFIM gained its popularity amongst Anon's hearts because the ideas and lessons from it are valid for the society we live in.
go outside, discover the world, face your fears and anxieties, stand united against adversity beyond your real differences... all that.
that's really the ideal of Anonymous.
Bronies are the radical opposite, they remain locked in their rooms, are not friendly, embrace themselves in their own prison, scotched on their facebook or tumblr, keep buying whatever hasbro sells with ponies, satisfies themselves in their hugboxes. for most of them, MLP is just a way to scream "look how different and rebel I am! Now accept me, I wear pink! Brony priide"
what have become a theory about the greatest loser a few years ago has been adopted; this machine ran out of control.