You'd like to think this means something good, like maybe the spy guys have some moral disdain for spying on citizens for law enforcement purposes but I think that's just wishful thinking.
My guess is that at best, this is about the spy guys not wanting to lose any advantage they have over high-value, careful adversaries who will walk away from a communication system if they think it could be compromised.
At worst, it's bureaucratic one-upmanship, with national security types wanting to keep their status over mere criminal law enforcement.
The downside is that it leads to parallel construction where law enforcement just uses the techniques anyway and then builds a legal case from evidence they wouldn't have been able to link together otherwise, burying the secret info along the way.
This may also encourage the spies to help law enforcement if they think their techniques may be used but otherwise obscured by the parallel case.