That is not exactly true. The basis of their conclusion in the 1978 report rested on a dictatabelt recording from a motorcycle that seemed to indicate “impulses” which were interpreted as shots. About 10 years later that recording was discredited because the police motorcycle was not at the scene at the time of the shooting. Robert Blakley who was the Chair of the HSCA in 1978, later stated that their conclusion would be changed based on the new information about the recording and would conclude no conspiracy if there was not a 4th shot. There was not a 4th shot. Again, I would encourage people to read Gerald Posner’s “Case Closed” published in 1993. He did not set out to disprove a conspiracy, however based on his exhaustive data/fact driven investigation came to the conclusion that The WC report while flawed in some ways, arrived at the right conclusion. Most people who support conspiracy theories don’t know many of the basic, evidence supported facts and aren’t familiar with the backgrounds of Oswald and Ruby which really explains their actions. To say that both were “unstable” is a huge understatement.