...state-threatening act of violence.
Unless the model plane is the size of a 747 or the explosive is anit-matter, how is that a "... state-threatening act of violence." Is Germany in such dire straits that a single model aircraft can topple a whole country?
They could shut down the BILD HQ for a day or two. Imagine that: Millions (no hyperbole, they sell about 2.5 million copies daily) of dumb people not being able to read the "truth" on the front page of their favourite tabloid and having to think for themselves! State-threatening indeed.