The photographic evidence can be forged. The written word, once recorded, cannot.
What a bizarre contention. You are truly living in a the conspiracy theorist world, where black is white, and down is up. Through the looking glass indeed.
In 1963, the technology did not exist to fake the Zapruder film and get images from the fake film onto the street in less than a week. And then to fake all the other films from Dealey Plaza to agree with the Zapruder film? To what end?
Wouldn't it be simpler to just burn the films and then life for the conspirators would be so much simpler?
Any idea why they didn't go that route? Alleging alterations of the photographic evidence implies stupid conspirators with an unlimited budget and plenty of time on their hands with nothing better to do than alter the evidence instead of destroying it.
And of course, these stupid conspirators decided to assassinate JFK in public, in front of a large crowd, many of whom had cameras, instead of taking an easier route:
1. If they could control the autopsy as you also allege, why not poison JFK? The autopsists could then find JFK suffered a brain anerysm, or a stroke, or a heart attack, etc. No films to dispute them.
2. Drug the pilot of Air Force One. When the plan crashes, claim the pilot had a undetected drug habit and fell asleep at the helm (like the Exxon Valdez skipper, etc.). No films to dispute them.
3. Threaten to expose JFK's many affairs. Tell JFK he needs to announce his retirement "for health reasons" immediately or his affairs will be revealed and he will clearly lose in 1964.
4. There are any number of other scenarios that are more workable than shooting JFK in public and then altering the photographic evidence, killing witnesses, altering the body, controlling the autopsy, framing a patsy, etc. etc. ad nauseum.
PS: Whether you understand it or not, alleging the photographic evidence is forged is synonymous with saying the photographic evidence disputes your theories (if it agreed with your theories, you wouldn't be alleging it was altered). This is tantamount to admitting you have no evidence.