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Yes, that's what makes Snowden and Manning interesting, they're a new kind of hero - heroes for people who don't read the news (or perhaps much at all).> There was very little in their revelations that was new and things dramatically worse were reported previously without gigantic data dumps of completely unfiltered and unrelated data. None of these things set the internet ablaze, despite being far more serious.
Even when accepting the premise that Snowden and Manning are mostly heroes to "people who don't read the news," that begs the question why they don't read the news. If the answer is (implicit) assumption that they are just ignorant, this reveals more about our own biases and ignorance.
First of all: it was not just "the internet that was set ablaze". Even if there were reports on these and other larger issues before, the amount of attention the media gave to the things (re-)revealed in the leaks is far larger.
There are many stories that journalists or papers don't dare to break, because of the risk to their reputation if the claims get disputed. There is a reason the panama and paradise papers take so long to unveil. Now the data was out there anyway, so they could safely comment on what was in it. There was no media doing information gatekeeping, and the question of whether the media was holding things back was also verifiable.
Which leads to my next point: the fact that it was unfiltered (and as a side-effect, often unrelated) was undoubtedly part of why it grabbed the attention of the public. It was seen as the untampered "truth", which made it more believable in the eye of the public. Another comment mentions that Snowden released "gigabytes classified documents the vast majority of which had nothing to do with anything questionable", which may be true, but we would not have known this otherwise. And again: this matters to the public perception.
Sure, this could be seen as a disservice to good investigative journalism in a way, except for the aforementioned gatekeeping problem being bypassed.
The full transparency aspect of these leaks makes the way it was perceived and handled fundamentally different. Whether you agree with the results is a different question, but to ignore all of that is doing the discussion a disservice.