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It's amazing that for fear of future repercussions, someone would create a throw-away account to express a sentiment such as this.

It's an excellent justification for allowing throw-away accounts.

Although one could have a "make throwaway account" link from the account page.

Or like Slashdot, and have a "post this anonymously" checkbox.

allow posting anonymously could work too, but that could open up a whole new can of worms.