Well, if the planet doesn't have an atmosphere, and everyone on the planet habitually wears their own air supply, and there was a helluva backdraft on Bespin/CloudCity that caused the hand to escape the planet's gravity, and then that handed floated in space for ~30 years until it reached the aforementioned desert planet, then...

No, no. The droid army realizes they're being forced to live and die as slaves and rebel. The Republic finds itself continually losing planets to the mass produced droid armies as each conquered world is converted into a giant droid factory. In order to survive against the overwhelming, self-replicating droid forces, the Republic abandons its morals to mass-produce an army of its own; the clones. Combined with the drastic, centralized wartime powers given to Palpatine, this moral decay leads to the rise of the Empire.

Not to nit-pick, but only the original movie came out in the 70s.

As amazing as the first one was, my favorite Star Wars movie is hands down Empire (1980).

True story: back when I watched it for the first time on the movie theater, I refused to believe that Vader was actually Luke's father, my take on it being that Vader was just lying to Luke in order to get him to join him in the dark side. I was so stubbornly refusing to believe this was true, that the next day at school I had a fist fight with another kid in my class who claimed Vader was Luke's dad for real Star Wars used to be serious business back then...