"It's not incredibly hard to imagine that no one would take it seriously if some nebulous phrasing like the "most important conflict space of the 21st century" is the content of our warning. Even less difficult to imagine if this is being espoused by an already untrustworthy three letter agency(ies)."These agencies have huge conflicts of interest in that their funding depends on how afraid the government is of the threats they're tasked with defending. So the more afraid they can make politicians, the more funding they'll get.
What makes their claims even less credible is that they're basically professional liars. They're trained in deception and have a long, sordid history of deceiving the public: often quite consciously and deliberately.
"the tension with the current bureaucratic classification system is that it limits what these organizations can actually tell us"
Even if they did tell us we could never know if they were telling the truth, as the public has absolutely no access to their internal records. They tell us what they want us to believe.