Quite, all they come up with is ill-thought-out theories.

It was astonishing to see the blood/bone/tissue splatter from the ballistic heads which behaved exactly the same as that from JFK.

Like you say, you'd think that everything would be projected in the direction in which the bullet's travelling but that's not so, some of the debris from the head was projected back over the trunk (the boot) in exactly the same way as from poor JFK.

In the film shot of the actual shooting, poor Jackie was scrambing back over the trunk trying to retrieve part of JFK's head which is why some people thought shots were fired from in front of the car.