Luke Skywalker was pretty stupid to not negotiate with his dad in Cloud City. What was he going back to anyway? A rebellion routed from their hidden base that let their one secret weapon (Luke) go AWOL on a forgotten planet and left their best female politician with a pirate that they had made a commander. Vader explicitly made a play for Luke to join him and overthrow the Emperor to rule the galaxy. It is "Vader's Coup". Luke should have said,
“Dad, let me go back and be a mole in the Rebellion, we’ll set up the Endor battle, I’ll mindwipe the Endor moon strike squad so they can be held by your troops, we’ll kill the Emperor, but leave the deflector shield up killing the entire fleet of useless rebels (side note: Lando/Wedge were competent), complete the 2nd Death Star and then you train me to start a new Jedi Order as we mop up the small remnants of the rebellion that didn't go to Endor, find me a wife, and set up the Galactic House of Skywalker monarchy through my kids. Deal?”
Luke can keep his friends around, discover Leia's Jedi powers and being his sister (Obi-Wan would appear in blue to chastise him for dealing with his dad setting up a great two fathers conundrum), and if he were reluctant to search for Jedi hoard the galactic difference maker (Jedi powers) to his family only. His family being the only ones with Jedi powers would be like a formal divine right of kings and allow for his family to have a competitive edge on everyone else. Their name is walking in the sky, and they have the power to do so. From a galactic standpoint, the Force is in everyone but only the Skywalkers are strong enough in it to manipulate it. They have a built in evil figurehead to blame excesses of the Empire on (the Emperor) as they pull off their coup. Vader even states ruling as father and son, implying that they can create a monarchy.
It's a great what if for a movie. This would never happen though because good must always win, and good as defined by modern Americans like George Lucas is rebellions fought in the name of republican ideals winning.