"Interesting - there was also an old rumor out there that the German insurgency got to him."
A common Russin ploy - blame it on the fascists.
Conspiracy? Or sometimes, a cigar is just a cigar (Freud).
Patton hated the Russians far more than he hated Germans, and perhaps dreamed of rearming and unleashing the latter against the USSR. Many in America also wanted us to stand back and just let the Nazis and Communists claw each other to death.
The sedan was not smashed to bits (photo). Restored, it reposes in the Patton Museum. I looked underneath it in 1977 and saw that the frame was bent, but nothing more. Gen. Patton was not only the only fatality, but the only one in the car even injured. A very finely tuned assassination, yes? The German Insurgency would have used some kind of what's now called an IED.
Eisenhower relieved Patton not because he was a loose cannon, but because of his public remarks, thought injurious to the Four Power alliance (which the Soviets abrogated anyway).
Gen Patton was a near-perfect, aggressive battlefield commander. That doesn't translate well to any other walk of life. Lost accident report? Welcome to the bureaucracy, circa 1945.
Let him rest in peace, in his soldier's grave.
That should be: A common Soviet Communist ploy - blame it on the fascists. The Soviet Commies killed millions of non Communist Russians as well.