So much is unanswered, and we keep being told that the conspiracy pundits are all sorts of nasty people whose evidence doesn't stand up under scrutiny.
I believe that there is evidence that it was a US government led conspiracy, but I also believe that they have been smart enough to keep out of any arguments, as if there are no discrepancies.
I think that this is so big that there will be nothing to see when access to documents of this era comes around.
Logic battles faith.