Mark Hope said:
You can take a purely philosophical approach and address the question of whether Vader's actions in saving Luke (including his self-sacrifice, as you point out) are enough to outweigh his evil actions over the course of his life up to that point. It can be seen as an issue of morals, rather than one of religion. There are plenty of real-world philosophies that address morals without taking recourse to religion. Beyond that, you can view it from within the Star Wars universe and use it to illuminate the workings of the Force. From the latter angle at least, one's post-mortem unity of the Force would appear to be dependent upon a purely internal state of conscience, rather than any external morality, for example. This raises the question "Is there justice for Vader's victims?", among other things.
And this is exactly the point Brin is making, and it's one that can be applied to all sorts of heroic fiction. In fact this idea of thinking of Vader's victims, as opposed to Vader's heroic sacrifice, is the
crux of Brin's argument.
Vader had a destiny. His destiny involved turning evil and killing thousands, maybe millions, before heroically dying by removing an even greater evil and redeeming himself.
This is a classic fantasy/legendary construct.
Within the "rules" of legend and fantasy, asking about Vader's victims is as applicable as asking about Achilles' victims. How many men died so that Achilles could live his life of glory? Was it fair that Achilles cut men down like wheat who couldn't hurt him because he was invulnerable? Was he really a great warrior worthy of glory since he wasn't in any real danger?
These are questions the ancients never bothered to ask. If you were favored by the gods or otherwise had an unfair advantage over your opponents, it sucked to be your opponent.
These are however, questions modern readers ask. We tend not to see things in absolutes.
And of course you can turn this whole thing around too. How many people does Luke kill? It's a lot. Think about how many crewmen were on the death stars alone.
Were they all evil? Probably not. Does that matter? Within the realm of heroic fantasy, not much. But it's a worthy question to ask and it does Brin credit to bring it up.
The Empire in Star Wars serves the same purpose as the Nazis in the Indiana Jones movies (or Hellboy or really any other movie where Nazis are used as villains). They're EVILLLLLLLLLLLLLLLLLLLL. So evil you don't need to ask yourself if it's ok to slaughter them in droves.
The fact that Nazis are used so often as villains is precisely to STOP the audience from asking the questions Brin is posing about the Empire. See? It's not just Brin. Modern writers realize their audience might say "whoa, I'm rooting for a guy who just slaughtered that sympathetic guard who just came outside for a smoke".
Star Wars tries to achieve this same effect (not worrying about the heroes felling scores of bad guys) through code. Sometimes they're faceless stormtroopers (who are identical outside and in- even if you take the helmet off they're clones), sometimes they're droids.
One reason to make them identical is so you never go "aww... I liked that guy!"
All in an attempt to let us off the hook so we can enjoy some mindless mayhem.
Chuck