We need to remember a lot of deals were made. Once presidential immunity is removed, the WH can go after all the presidents involved in pushing America towards tyranny. But in Carter’s old frail age people will not respond kindly to military tribunals for a frail old man who, while had is own set of fuck ups, isn’t necessarily hated at such a vitriolic level compared the Bush, Clinton, etc.
I’m guessing a plea was made much like the Queen. When the royal family goes down all eyes will be on King Charles not Elizabeth. When the American presidential dynasties go down, Carter will not deal with much criticism after his death.
TLDR, Carters death is his plea deal. When we go after the DS you can keep your legacy as being a peanut farmer president.
Carter will be allowed to go down in history as a guy who was well meaning, but in over his head.
Interesting note, there is an Amazon produced series set during the Carter Presidency that portrays his Administration as being manipulated by German Nazis. Some of them were brought to the United States through Project Paperclip and others infiltrated his Administration posing as American citizens.