To be clear I'm not endorsing that view, just saying that it's hard to rule out anything now, given how deep the rot seems to run.
At one point I became very interested in the topic and read/watched everything I could find about it. For awhile I had maybe 30-40 books on the subject and had read probably that many more besides. I don't know how many documentaries I watched. I still have a copy of the Zapruder film around somewhere.
I started out with the thought that my knowledge of firearms and my experience with them would give me a significant edge in cutting through some of the confusion and maybe helping point towards proof of a conspiracy.
I finally assembled enough of a library and enough information that I could start tracing back allegations and claims to their sources. I could actually find good solid facts where they existed and discount allegations and claims that couldn't be sourced. That's when things started unraveling. Every single juicy piece of "evidence" was either easily discredited (like the claims that the shots were impossible), could be traced back to a source that wasn't credible, or could be traced back to a source that made the claim without attempting to support it. I found out a lot about Jim Garrison who was likely insane and who provided a huge amount of the conspiracy lore out of his own tortured brain. Oliver Stone's movie was based largely on Jim Garrison's deranged ramblings and watching it is as useful to understanding the subject as watching The Matrix is useful to understanding the laws of physics.
So what was the result? I still don't know what happened because it's not possible to say for certain. But here is what I do know.
I know that a lot of what people believe to be hard facts in this case are absolute bunk.
I know that I was unable to find a single piece of credible evidence that proved, or even strongly implicated that LHO did not shoot JFK, that LHO worked with accomplices, or that LHO was either knowingly or unwittingly part of a conspiracy.
I can't prove that LHO acted alone or that he shot JFK, but I can say that all the
credible evidence I found points in that direction and none of it points in any another direction.
I did come to one very solid conclusion: It only takes one crackpot a few seconds to propose a theory and make up some supporting evidence. It takes a lot of people a lot of time to disprove a theory and disprove the supporting "evidence"...