There's nothing to argue.
Because of the consilience of the evidence.
https://www.merriam-webster.com/dictionary/consilience
Consilience: the linking together of principles from different disciplines
especially when forming a comprehensive theory
So we've got Oswald's rifle found in the Depository (handwriting analysis,
business records, PO money order, PO Box, photographs);
three shells at the window traceable to Oswald's weapon to the exclusion
of all other weapons in the world (ballistics);
two large fragments found in the limo traceable to Oswald's weapon to the
exclusion of all other weapons in the world;
one nearly whole bullet found at the hospital traceable to Oswald's weapon
to the exclusion of all other weapons in the world (ballistics);
witnesses that described the gunman as a young white male resembling
Oswald;
Oswald leaves almost all his money behind for Marina along with his
wedding ring on the morning of 11/22/63, the morning of the assassination
(eyewitness testimony);
Oswald's fingerprints on the trigger guard (fingerprint analysis);
Oswald seen with a large paper bag the morning of the assassination
(eyewitness testimony);
A large paper bag found next to the sniper's nest bearing Oswald's prints
and with fibers matching the blanket (fingerprint analysis and fiber
analysis);
Oswald's being arrested after resisting arrest in the theatre and
assaulting a police officer (eyewitness testimony and photograph of police
officer McDonald who was assaulted by Oswald);
Oswald's revolver taken from his hand during the scuffle in the theatre
(business records, eyewitness testimony);
Shells recovered at the scene of the Tippit killing that were matched to
Oswald's revolver to the exclusion of all other weapons in the world
(eyewitness testimony, ballistics);
testimony from eyewitnesses who picked Oswald out of police lineups as the
man who shot Tippit (eyewitness testimony);
a note from Oswald to Marina explaining what to do if Oswald is arrested
(handwriting analysis, eyewitness testimony);
this note above was discovered by Marina on the night of the attempted
assassination of General Walker and it mentions he left behind almost all
his money (handwriting analysis, eyewitness testimony).
There's more, but that's enough for now.
How CTs can ignore all that evidence to concentrate on the gaps (how come
JFK's head moves back?, how could he fire two shots and hit JFK and
Connally so close together?, why didn't Johnson mention the discovery of
the rifle he had nothing to do with?, etc. etc.) is beyond my
understanding. I have a suspicion it's because they are not looking for
the most reasonable solution, but any solution *consistent with a
conspiracy*. Which means they have to disregard all that evidence or find
some reason to justify putting that evidence aside.
Which leads to a whole lot of conspiracy arguments like the shells were
planted, the rifle was planted, the money order is fake, the body was
altered, the Zapruder film was altered, the witnesses were killed or
intimidated, the bullet was planted at Parkland, a Mauser was found, not
Oswald's Carcano, the autopsy x-rays and photos were altered, that's not
JFK's body in the autopsy photos, it's Tippit's, somebody else did the
shooting and Oswald tried to stop it. All kinds of bizarre nonsense that
doesn't withstand scrutiny, all because of some need to have a larger
cause for the President's death and to assign some meaning to it beyond 'a
guy with a gun and a grudge'.
God knows we've seen enough evidence of what one guy with a gun and a
grudge can do since JFK's assassination (Texas Tower, Aurora theatre,
Orlando night club, Hinckley, Chapman, Squeeky Fromme, Sara Jane Moore,
etc. etc.) - isn't it time to accept the evidence, accept the fact that
Oswald shot JFK and let this search for a massive conspiracy to provide
some meaning to the man's death just wither away and die?
Hank