IMHO, it had deep Masonic roots. Almost any significant power structure could have been involved and most likely played adequate parallel interests where multiple parties were involved. Oswald may have simply been a patsy, but a very knowledgeable, willing, and plausible patsy.
Whomever was involved, I perceived part of LBJ’s depression after his first term may have been subsequent to recognizing the limits of his power to control such a beast.
I saw a VERY convincing tv show placing the blame squarely on the Masons! The show was sandwiched between the one describing the lonely, furtive wanderings of the sad and misunderstood Bigfoot, and that great documentary about the nubile young girl who was kidnapped and sexually abused by aliens.