Media outlets need experts for various subject areas. Is it possible that former security officials still have some personal agenda? Sure, but even among the list of names provided, you have people of various agencies under different administrations with quite a variety of different philosophies. You also listed a low-level FBI agent who only served 4 years such as Asha Rangappa next to James Clapper and Michael Hayden. If you want to think Clapper and Hayden are still carrying a torch for the agencies they led and pushing an agenda, I can see that is possible (Although I think it’s more likely with Clapper than Hayden.).
But somebody like Rangappa has no inside information or connections to agency heads that would indicate she has any similar agenda.
I do take issue when reporters bring on experts and don’t question them skeptically enough. But these hires of former national security officials seem like decisions made not to push a narrative, but to have knowledgeable people to turn to when international affairs make the headlines. I don’t really watch MSNBC or CNN; I stick to the PBS News Hour, BBC, and NPR. I have to say that the BBC is the most adversarial in their questioning when it comes to such issues. But PBS and NPR are both pretty good as well, depending on which reporters cover it. I especially like it when PBS brings on 2 experts with different points of view.