High ground with the car moving past at 10 mph. Oswald knew how to shoot from his time in the Corps. The route had been published in the papers. Plus he worked there. He had the political leader of Capitalism passing right under his nose... how is a comrade supposed to pass that up? He didn’t.
But people absolutely love tasty conspiracy theories. So when fellow traveller Mark Lane of the communist front National Lawyer’s Guild produced ‘Rush to Judgement’ it was gobbled up like ice cream. That old commie suckered more people than PT Barnum.
It has been often asked why Oswald did not fire on Kennedy as the car moved toward him in the book depository when it would give him a clear target and more time to shoot, rather than waiting to shoot after the car made a left-hand turn and was proceeding away from his location. I was at the shooting site and drove the route the Kennedy limo took, and the only explanation I could imagine is that Oswald waited for the left turn because it placed Kennedy in a kill box for more than one shooter. ‘Classic ambush technique.
Sometimes there IS a conspiracy. Over 80% of the people believe there was. The only thing close is TWA 800.