Some of the danger lies in (due to having a biased view) looking at only one viewpoint. Example: If you believe that lions are always violent, the photo on the right might be all you care to look at. Another viewpoint (the left photo) shows an entirely different situation. But if one has been conditioned to believe that lions are always violent, one might not think that the left photo is genuine.
Now, think about the practically universal distrust of the authorities apparently present in the CT community. And the implications of that bias as it applies to their viewpoint and interpretation of the JFK assassination case. It is no wonder why essentially every piece of evidence has been “declared” by them to be corrupted in one way or another. They appear to believe that practically all the evidence is tainted. Why else would that be, except for a biased viewpoint?
Charles, it's not a super complicated problem.
The reason JFK conspiracy theories still persist is because of the EVIDENCE.
It's a fact that many pieces of evidence in the case have problems due either to incompetence or corruption by the Dallas PD. Their incompetence also led to the murder of Lee Oswald in their custody (which in and of itself fuels conspiracy theories).
It's a fact that there were institutional cover-ups by several of the agencies involved with the investigation.
It's a fact that most people watch the Zapruder film and view it as evidence of a second shooter (not everyone will buy the explanations of why Kennedy's head jerked violently backwards).
It's a fact that the botched JFK autopsy has created more confusion about the Medical evidence on both sides of the debate.
So with those issues in mind, it should be obvious why JFK assassination CT's will never go away.
I don't group JFK CT's with other CT's like 'Q-Anon' or 'faked Moon Landings' because there's plenty of reasonable questions about the evidence in the Kennedy assassination.