It is, because a Sith Lord like Darth Sidious cannot become a ghost because he cannot be selfless, having no thought of himself and cannot let go of the mortal world. If Luke had killed Vader, either in anger or in passiveness, Obi-wan and Yoda couldn't help Anakin to retain his identity. He had to let go of everything that he held on to as a Sith Lord and in doing so, he was able to do what only three other Jedi had been able to do. Retain his conscious self. If Han died at Bespin, he wouldn't be able to retain an identity because he has no knowledge of the Force like Luke. When Vader killed Nute, he couldn't for the same reasons, but also because he was a selfish individual. The standard of right is by which he choose to do it for himself, rather than what you or someone else would do. There is no wrong in this situation. As to getting paid, Shaw was already getting paid. Hayden's pay was probably only for ROTS. You can have the discussion, but in the end, it really doesn't matter why he did it. Shaw is the result of Anakin's poor choices when unmasked and all that came with it. I don't believe it is underestimation. Rather it serves as a symbolic gesture to take it back to that point, rather than have it as it had been with Shaw. Old Anakin is the physical shell of what he was in life. The younger version is in essence what he had been without taint. It is the true self that Luke spoke of, bogged down and caked in evil and sin. The Netherrealm of the Force is a passage of sorts that only accepts the true person with the sins washed clean. In TESB, Vader wants to use Luke to help him take out Palpatine and that is still true in ROTJ, though it is more subtle than in the former. Palpatine then wants to turn Luke in ROTJ, so that he can eliminate Vader and have Vader 2.0. This would become an issue by the end of the film. Luke is also a threat because as Palpatine says, Luke could destroy them which goes back to ROTS about eliminating all of the Jedi. That's because those changes were less visual effects and more story changes, which included some visual enhancements. That was mostly the case in the 97 SE's. He hadn't planned to change those films, but did so as he went along with changing ANH. The 04 changes were more about story continuity with TESB and ROTJ. The Blu-Ray changes were mostly audio and visual alterations. The same way he second guessed himself with "Close The Blast Doors!" in ANH, where he removed it back in the day and then put it back in with the SE's and the changes to Obi-wan's roar in ANH.