(Barr’s investigation threatens their very existence)
This is an interesting angle that deserves our attention.
That part of the Deep State that wanted Hillary to win is not (necessarily) related to or connected with the Deep State that is developing advanced defense capabilities and/or is hiding UFO secrets (to the extent they exist).
In fact, there is no reason to believe that the latter Deep State is one unified body. It might consist of many splintered "Deep States," each with its own loyalties, benefactors, and goals.
If the Barr investigation had begun to dig into "certain" Deep State activity, Barr would have disappeared or mysteriously fallen into a coma.
Barr threatens nothing but a handful of supeficial elected and appointed people...and he knows it.