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He's in "I want corroboration" territory for me. The big scoops - My Lai, Abu Gharaib - were backed up with hard evidence and other organizations confirming the allegations. Stuff like "the US faked Bin Laden's burial and chucked chunks of him into the mountains" have, thus far, not been.
Neither were some giant secrets, and were previously dismissed as unsubstantiated rumour. Hersh collected enough factoids together to substantiate them enough to become a news story, rather than a military legend.