Just putting on my sanity beanie for a moment, it occurs to me that if I had spoken about JFK being whacked and did in fact have inside knowledge of the hit, I probably would not have been standing on a sidewalk in full view of photographers at the scene of the crime on November 22, 1963. But maybe that's just me. Most of the Three Stooges' humor went right over my head, I'll have to admit, and perhaps Milteer did view himself as the Moe of the plot. Could he - just thinking out loud here - possibly have been Prayer Man, too?
Your sanity beanie needs a sanity check. Let's start with two key facts that you've ignored:
One, Milteer only revealed his knowledge of the JFK plot to his long-time friend William Somersett.
Two, Milteer had no idea that Somersett was a Miami police informant and that their conversations were being recorded.
So Milteer had every reason to think that it was completely safe for him to be in Dealey Plaza to watch the assassination. He had no reason to think he had anything to worry about if he were photographed or filmed by bystanders.
Furthermore, what about the man in the Altgens photo who so strikingly resembles Milteer? He's a dead ringer for Milteer. What about Adams' identification of the man as Milteer? Adams What about the fact that even the HSCA's photographic experts admitted that the man in the Altgens photo “bears a strong resemblance to Joseph Adams Milteer,” that the man resembles Milteer "in age and general facial configuration," and that the man is wearing eyeglasses similar to those worn by Milteer?
Adams surveilled Milteer before he interviewed him, even standing next to him to get a good look at him. Then, after Adams and another agent apprehended Milteer to take him in for questioning, Adams spent over an hour with Milteer in the back seat of a Georgia state patrol car on the way to the FBI office in Valdosta. He spent nearly an hour interviewing Milteer to get as much info as he could within the narrow limits that his supervisor had established for the interview.
Adams positively identified Milteer as the man in the Altgens photo.