People like you need to figure out that epistemology is a thing. That you can't 100% believe anything. That it's not wrong to admit 20% probability to something fantastic, and that it's gullible to 100% believe something else, just because it's all you've ever known.

If you can't find room in your mind to admit some 20% probability that, with all that the intelligence community has done, they might also be replacing people, then you just need to get out of the room. Let the probabilities be weighed by people who are OK with uncertainty.