I especially like the manner in which Doug Horne encourages other students of JFK to abandon their long-held but probably-false belief in Zapruder film authenticity:

"The biggest problem we face right now in the JFK research community are the legions of "old guard" researchers who refuse to face this fact [that the Z-film has been fabricated] and who stubbornly cling to some piece of "bedrock evidence", which in their mind will lead them out of the wilderness if only they study it long enough and can divine its true meaning. For Thompson, Wrone, Weisberg, Groden, and may others, the Zapruder film has been this piece of bedrock evidence for over four decades. I say to the old guard who have continued to insist that the Zapruder film is an authentic and unaltered film in spite of the mounting evidence of its alteration, "Come on over, and see the light." You will feel better for having done so--in fact, it will liberate you. Once you accept the fact that the Zapruder film is a clever (but imperfect) forgery, you are free suddenly to believe the Dealey Plaza car stop witnesses (which include several Dallas motorcycle policemen and Bill Newman); Marily Sitzman; the Kodak laboratory personnel (who all say the original film was slit the evening of the assassination); Marilyn Willis; Erwin Schwartz; Cartha DeLoach; Dan Rather; and the Parkland doctors and nurses. For if you believe the Zapruder film is authentic, you must, of necessity, believe that all of these people are either liars, or incompetent and unreliable witnesses.