You can say it's bullspombleprofglidnoctobuns but facts are facts. The witnesses are there and they are credible witnesses. Remember how the motorcade was lined up, most important people first. SS Agents smelled gunsmoke, behind the SS Agents limo was Congressman Ralph W. Yarborough, a WWII veteran who said he smelled gunsmoke and me being a Viet Nam vet I can tell you I know what gunsmoke smells like.
The government would not back the theory, they covered it up. Can you image the outrage there would be if the governmental department charged with protecting the President was responsible for killing him. Watch the documentary "JFK-The Smoking Gun", it will convince you I'm sure.