You should ask one. (If any actually exist) Personally, I don't know of any. If you mean LNs, why do you assume they do automatically believe whatever cops say? Anything to back up that huge assumption?
PS Seen the expression "evangelists" in a few of your posts now..new buzzword?
Not particularly new. The "Oswald did it" position is a religion. With a creed and inerrant holy books.
Yes, read Litwin's article. His entire argument is that nobody should believe Mercer because the cops (or the FBI who are cops) said something different. And they didn't even say anything that different. There was a truck there at that time and somebody probably took something out of the back of it. So why is there such a drive amongst the WC faithful to discredit and try to destroy any witness who could be at odds with the official narrative?