i understand that ush, but there are degrees to attachment.
obiwan was attached to anakin.
"anakin, dont try it!"
here he is dealing with a sith. by all aspects of the jedi code, anakin is lost and must be killed. and here we have perhaps the most ideal jedi begging his friend to not let himself be killed, which very well could have proven to be fatal. he could have died due to his own attachment.
(in tears) "you were my brother anakin!!! i loved you!!!"
attachment, even at the bitter end
"The Jedi are trained to let go. They're trained from birth. They're not supposed to form attachments. They can love people- in fact, they should love everybody. They should love their enemies; they should love the Sith. But they can't form attachments. So what all these movies are about is: greed. Greed is a source of pain and suffering for everybody. And the ultimate state of greed is the desire to cheat death."
i think the rift in ideas is created by the word "attachment". GL means attachment as in greed, not being able to let go. but attachment cannot be black and white. obiwan DID have an attachment to anakin. that attachment was love. he did what he had to do, but in your black and white world of star wars, obiwan should have just cut him down, said " *sigh* oh well", and whistled a merry tune as he skipped back to padme's starship. well that wasnt the case. instead, it scarred him and forced him to live with a terrible bitterness for his old friend, never wanting to grasp the fact that there was still good in vader. but padme and luke felt that good. and WHY? because they were not trained as jedi in the sense of the old code. they were just regular people.
how much more obvious could it have been that luke was BETTER than a jedi, in that he could find hope in the hopeless. his own father killed his mentor, tortured his friends, blew up his sisters home world, cut off his hand, and threatened the very existance of all he knew and loved. any jedi would have considered vader dead to them, as way par for the code. but after all that, luke had compassion and HOPE for his father.
the finality of RotJ was that luke was right and the jedi were wrong, or rather mistaken.
"once you start down the dark path, forever will it dominate your destiny"
"he's more machine now than man...twisted and evil"
in a sense they were accurate, but their black and white thinking left them blind to the very thing that SAVED the galaxy: a sith COULD be redemed, given the right influence.
if the saga had played out according to what the ideal jedi would have done, luke would have tried to kill vader and sidious, and he would have FAILED. whether struck down or turned to the darkside, a strict adherence to the code would have left everything in darkness.
the jedi were mistaken ush, thats the whole point of the conclusion.
thats what set luke above ALL, and why he is the true hero of the story imho. he did the ABSOLUTE TABOO of the jedi code. "this is your life". a jedi NEVER parts with his saber. and what conclusion did luke come to in the end? he lost the saber. he refused to do the duty of an old republic jedi. and that was the very right thing to do.