I'm sorry, but that's the not big conspiracy of the Star Wars universe. The true conspiracy is the Death Star!
Let's take a look at the official story -- and I emphasize the word story. The designers of the first Death Star weren't stupid. Tell any competent starfighter pilot to hit that heating vent at full speed, down a trench where you're a sitting duck for enemy fire, and he'll tell you that it's impossible, even for a computer! And some farm boy who's never piloted anything but civilian vehicles, and never in combat, makes the shot on his very first ever attack run? Bull droppings. And Darth Vader, the second in command of the entire Empire military, piloted a TIE fighter personally and that's how he survives. Again, awfully convetient.
Yavin was an inside job, an excuse by the Empire to declare martial law throughout the galaxy!