You want to know why they don't discuss bans? A few possible reasons, none are good.
A. They don't want to spend any of the hundreds of millions made in profit in supplying customer service to it's players.
B. They don't care about they customers AFTER they buy the game, don't mistake that for potential customers, they LOVE those.
C. They -blam!-ed up with the autoban software and are now covering it up. If they unban anyone, they admit failure. Have you ever know Bungie to admit failure? I haven't.
D. (and the most likely in my opinion) They're a pack of greedy pricks.
E. ALL OF THE ABOVE.
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Don't forget, they also don't want to give any technical details to anyone who may be actually cheating so they can't figure out how to bypass the anticheat system.