I've never thought that there was any kind of JFK conspiracy, however, I have always been somewhat puzzled by the timing of the three shots, since they seemed to have been made in a very condensed time-frame to be so accurate.
Recently, I saw a new and well-done examination (from last year) of the evidence and I now understand that there is a "new" and much better explanation of the three shots.
The examination was very well researched (thru film study (the Zapruder film and a couple of other films/still pictures were enhanced), eye-witness reports and computer re-enactment). The "new" explanation was that the first shot was taken just after the motorcade turned left, just in front of the Texas Book Depository building. This shot did not hit anyone in the motorcade because there is an over-head road sign just at this point in the street that impeeded the shot. This over-head road sign is still in the Plaza today, but has been changed somewhat since 1963. This 1st shot is some 5 seconds before the next one, so the timing of all three shots overall is a much more reasonable length of time. Any visual evidence of this shot is missing from the Zapruder film because the Zapruder camera is turned off for about 5-7 seconds as the motorcade makes this left turn onto Dealey Plaza.
There were a number of eye-witness accounts who said that they heard the first shot just after this left-hand turn.
In addition, an early shot like this would better explain the location of the three bullet casings that were found. Two casings were found together, while the third one was in a different location. The rifle would have been pointing in a significantly different direction to have made this first shot, so the bullet casings would get ejected in different directions.
GTsail