Oswald was a loyal American who became enmeshed with the CIA while in the Marines and was undoubtedly led to believe that he was doing something to help the country. He never fired a shot at anybody. He was standing on the front portico of the Texas School Book Depository with his arm wrapped around one of the columns when James Altgens took his famous #6 photo which coincided with the very moment that JFK was shot in the throat by limo driver William Greer around 12:31 PM.
In that photo, you can see JFK – through the front windshield – clutching at his throat with both fists clenched. You can see Oswald is wearing the same clothes that he was wearing when he was captured in the movie house. The CIA tried to pass off the lie that the guy on the portico was another guy named Lovelace (who they planted at the book Depository intentionally to create confusion), but it’s Oswald for sure. The next shot fired inside the limo, a moment later, went into Gov. Connally’s right mid-back area and exited out the front chest to crash into his right forearm/wrist (which was nested against his chest as he had turned around 180 degrees to gawk at JFK squarely and was blocking Greer’s line of fire to finish off JFK). Nellie Connally realized that Greer was doing the shooting and pulled her husband down onto herself to get him out of the way, which allowed Greer to fire the fatal head shot seen in Zapruder frame 313. The most accurate account of what happened on November 22, 1963 in Dealey Plaza is explained in Murder from Within by Fred T. Newcomb and Perry Adams.