Is there hard proof though that the Podesta leak was just a mass fishing by-catch and it was nothing else? It would be trivial for a hacker to place false email

Is there hard proof though that the Podesta leak was just a mass fishing by-catch and it was nothing else? It would be trivial for a hacker to place false emails as a red herring. What I find more interesting than the origin of the leaks is that almost nobody is talking about their content. Little in the US, almost not at all internationally. The only reporting about the Podesta leaks I noticed was that they occurred, and that some people described as cranks were discussing them on reddit - but at least in Germany no discussion of the contents, and in US media not much more. Same for the DNC leaks. The "pied piper" memo, where Democrats were hoping Trump would win the primaries... And how they tried to undermine Sanders - how did that not cause more outrage?