For what it's worth -- and speaking only for myself -- I started those two topics (the Amazon protest and the Gamers Bill of Rights) in the Arena simply because it seemed the most appropriate place. These are issues that affect gamers, after all, so where else to better discuss them? Granted, there's a bit of overlap with the Backroom when they have threads discussing the RIAA and whatnot, but that's more the exception rather than the rule.
Not that I want the Arena to be forever dominated by such discussions, of course -- I agree its primary purpose is still to discuss actual games. That's how it should be. Still, I don't see the harm in actually discussing issues that matter to gamers from time to time. (It's not like the Frontroom is all sunshine and lollipops, just for another example.) Besides which, I concur with froggy that these are simply hot topics at the moment, and will eventually fade in time.
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