I think part of the issue is that, unfortunately, there
are conspiracy theories that have proven out to be true. The military's thumb pushing the scales on Hollywood's war depiction through careful deliberation of allowing use of equipment has the added effect of limiting the resources of any military narrative the us military doesn't approve of. There is actually in existence a conservative court group whose entire existence is to funnel conservative justices, including things like politically-aligned clerking for supreme courts and providing republican appointers with lists of politically-aligned candidates. A federal program really did exist to try and figure out if they can brainwash people with acid, and then records of the program mysteriously went missing when the public tried to investigate it. Epstein's book exists and all its implications thereof. Microsoft's early "embrace, extend, extinguish" is a conspiracy theoy about Microsoft's business dealings that turned out to be true.
It's really hard to turn back on the "but realistically, conspiracies are uncommon" brain when exposed to the fact that actually decades-long conspiracies do actually occur and produce results.
[Caveat: I don't actually believe in shit like flat earth, and am skeptical of all conspiracy theories if their evidence is some shit like a 45 minute youtube video with their own sources of, idk, a blogspot post. But I do want to acknowledge that conspiracies have been reported on in relatively trustworthy news reporting sources, and that I myself find it really difficult to determine true vs fake conspiracy theories if multiple news reporters are contradicting each other.]