There is no factual evidence that proves or suggests multiple shooters in the assassination of JFK. All suggestions to the contrary rely on imaginary and contrived conspiracist trash fiction literature combined with willing believer being preyed upon by the schlock authors who pose these conspiracies for counter culture fame and profit.
Lee Harvey Oswald was the only shooter that day and murdered President Kennedy all by his lonesome.
The specific reason he did so died with him, but the most likely reason was that he was a truly delusional human being who believed he’d have the gratitude and goodwill of the communist Cuban government whom he intended to declare his defection to.
No factual evidence? Just the evidence from the Warren Commission?