The lesson Greenwald draws from the Hatfill case:

No matter how many Steven Hatfills there are -- indeed, no matter how undeniable is the evidence that the Government repeatedly accused people of being Terrorists who were no such thing, even while knowing the accusations were false -- the authoritarians among us continue to blindly recite unproven Government accusations (but he's a Terrorist!) to justify the most extreme detention, surveillance and even assassination policies, all without needing or wanting any due process or evidence.  No matter how many times it is shown how unreliable those kinds of untested government accusations are (either due to abuse or error), there is no shortage of people willing to place blind faith in such pronouncements and to vest political leaders with all sorts of unchecked powers to act on them.

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