him to the dark side and was still able to stay strong. He faced the death of all his friends in the rebellion, the possibility of Vader going after his sister, his father trying to get him to join with him, and the emperor directly trying to get him to turn. And he still threw his saber down and rejected the dark side.

Luke turning to the dark side after all that and redeeming his father would cheapen the OT way too much.

On a side note - the emperor really messed that situation up. When he turned Anakin in the PT it was a LONG process from when Anakin was a young boy in which he manipulated him and put him in situations to question the Jedi and everything he had been taught. The Clone Wars series really did a good job of showing a lot of that manipulation, and the complex relationship he had with Padme. All of that made the quick turn that Anakin made in ROTS way more believable.

Also his final turn came after Palpatine had him kill Dooku and later attack Windu. Both of these actions were clearly wrong and left him with no option but to turn to the dark side. But in ROTJ when he tried to turn Luke he wanted him to kill his own father? That would have been much more difficult of a turn, and it would have been after just meeting Luke vs. having manipulated him over most of his life like he had Anakin. I guess it was really just a hail mary - Palpatine didn't know who would win between Vader or Luke, but he knew that in the end he would have one apprentice that would be stronger than before. If Vader won he would have proven his loyalty by killing his own son. and if Luke had won he'd have a new, younger apprentice who didn't have to deal with the injuries that Vader had.