Laugh til you fall out of your chair, but, I always thought that the 'ol wifey had something to do with it or some part in it.
He was a piece of S*** husband, she came from real money and power, and she had ways and means around her to make it happen. Cahoots with LBJ..?, from Texas no less.
She could have easily been the one in his ear to keep the top down, that he repeatedly told secret service that he wanted down. Something as simple as this being her only part to be in his ear and make sure it was so.
I can hear her the the night before,
"honey you need people to see you, and you and me together. It only helps make you more the people's President....". Next day, after all he is just a married man too, and he is going to do as his sweat heart told him in bed while discussing.
More so, who benefits in his death? We have the usual suspects already known. But, just as is life and in any murder case, there is a short list of people you start with. Think about it, she became the icon and the immortal Jakie O. She, and the family heirs, benefited greatly in terms of his death for decades and til this day.
Not saying that she was solely responsible or that she initiated it, but.......