Evil is part of the human journey, especially within the history of Star Trek in which there are multiple wars between contemporary time and Star Trek future.
Vs. someone who slaughters allies for fun, and people cheer watching slaughter hero troops.
Sorry, the clamoring for a Vader film is very off-putting to me, given the outcry against Rey as an overpowered Mary Sue who never goes through any changes in the films she's in. A Vader film would largely be around a Vader being a dark presence with little dynamic to it in terms of character development, as well as overpowered abilities that the comics insist upon giving him.
Sorry, it doesn't appeal to me, and I would rather revisit the Mirror Universe 100 times over than see a Vader film.
I was only clamoring to shore up his characterization. I don't like Vader at all. He scared me when I was five, nightmares and all, and he is a murderer, selfish, power hungry, and controlling.
He wouldn't be the hero; this is dystopic. He would turn bitter, trying to kill what little is left of his humanity in running from emotions he cannot control. If you see me on this board, I am much more drawn to Picard stories, than Vader.
My read is that his lust for power is from being told he is "the chosen one," feeling powerless, and grabbing for more power. Over, and over, and over again.
My read on the character is that he is sadly devoted and incredibly selfish. He cannot lose his wife, he never should have married, and will throw away the Republic, and the lives of the Jedi, in order to save her. That's not love. That's avoiding loss.
I don't feel he is redeemed or ever a great man. He competes and hates Obi-Wan for "holding him back!" He kills the Sand People, confesses to Padme, she does nothing but marry this murderer, and say nothing. The same murderer in II is the same murderer in VI.
Telling cautionary tales is possible. Doing so in the universe Gene Roddenberry created, difficult to do behind the three-pointed star.
This isn't glamorizing it like Sopranos or Breaking Bad. This is truly a man with serious defects of character. We are not to be like him.