I rather make this a new post than an ETA:
While a great deal of suspicion is in order, the notion that the current “services” (BfV, BND, MAD) are, in general, right-wing dominated is quite close to conspiracy stuff.
Which isn’t needed. It’s actually rather counterproductive to claim this, because valid criticism can be dismissed this way. The lack of proper parliamentary control and the far too many problems the “services” do, quite objectively, have, are by far enough to demand a radical change.