It's unfortunate when most people who think they are victims of a conspiracy are mistaken or delusional, but sometimes people actually are.
We can't just disregard all of the claims, we also can't just credulously believe every claim, but they also are numerous enough -- and difficult enough to investigate -- that we also can't feasibly do a thorough investigation of each.
I suspect it's probably the case that most are crazy, but I'm not confident. Youtube, reddit, etc are where I get this impression from, but these sites optimize for views and therefore have a tendency to amplify the more sensational examples of anything.
We can't just disregard all of the claims, we also can't just credulously believe every claim, but they also are numerous enough -- and difficult enough to investigate -- that we also can't feasibly do a thorough investigation of each.