[0]: https://projekte.sueddeutsche.de/paradisepapers/politik/die-... [1]: http://www.tagesschau.de/
EDIT: I just saw, they made more stuff available to the public, yet the concrete pieces on people using the system are paywalled.
because in Germany the coalition bartering takes precedence at the moment (where, like the election of the catholic Pope, every tiny signal is massively amplified to keep the buzz going), and it doesn't exactly help that Trump spews out new nonsense every other day, and the neo-nazis from the AfD can be counted upon to do the same if there is nothing newsworthy at the moment...
And the AfD is actually a major part of the problem - they have shifted the discourse from "ultra rich vs poor" to "everyone against Muslims/refugees" pretty successfully and that's shame enough.
Your analysis is on the point, but I believe that the AfD is more of a symptom and not much of a cause.
Now you at least know why the New Yorker didn't.
Joking aside: Probably because they did a good job with the Panama Papers. So it's a mix of strategic investment in investigate journalism and a bit of luck.