It looks like that Germany is in the midst of some low intensity power struggle between many factions within the political system whether intelligence agencies, Merkel's govt, the judiciary and finally the press.
I think the reason for this is mainly less budget partly due to the fact, that the German agencies are often not federal agencies, e.g. each tiny state has their own Verfassungsschutz.
I mean, the NSU affair was really bad, but incompetent-criminals-bad not secret-state-government-bad.
On the other hand, it is a very bad sign for the democratic system of the this country, when now even a warning from the OSZE has arrived in this topic. I remember years, when only third- and fourth-world or Eastern Bloc countries got such warnings and in the German tv it was shown, so we Germans could smile and say, that we are better than "those".