The better question is why isn't B flag closer to the center of the map instead of obviously closer to C.
Then we don't have this completely ridiculous problem
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It's the fact your fighting uphill if you spawn at A. B and C are very easy to defend with snipers, and the lanes leading up to them are all bottle necks. That leaves the middle tunnel, which is just a zone of doom and despair. If start the game at C spawn, it's very hard to -blam!- things up.
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Exactly so B should be moved to a different location to give A spawn a fighting chance. Its one of the most lopsided maps for control in the game.