Star Wars (and pretty much all modern tales) splits good and evil along ideological lines, as in the "baddies" are all about oppression and rule by fear, whereas the "goodies" are all about the power of love. It's so universal and ingrained in modern society that nobody seems to recognize it anymore.
In modern story telling, you have the following major "good" and "evil" types:
- The pure good
- The good who is tempted by the dark side, but is eventually redeemed.
- The good who is tempted by the dark side and is forever corrupted.
- The rogue who does good by shady means so that the major characters can have a clear conscience.
- The evil who is redeemed by love and turns to the good side.
- The evil who is irredeemable.
You'll also notice over the past few decades how the "goodies" eventually stopped killing, and eventually even harming others, even in self defense (Remember the 80s, when Han shot first?). It's always the evil one hoisted on his own petard.
So in modern stories, the goodies live by a code of zen-like purity as a means to prove that goodness always defeats badness without sullying itself (except in side-stories about the rogue characters).
So what do you have in Saul vs David? A jealous and envious brother whose neuroses drive him to the edge. Is he evil? Does he revel in his evilness? Does he pat himself on the back for doing his share of evil this day like Darth Vader? No. He considers himself inherently good, but hard done by, and wants to even the scale.
Now let's look at Death:
I looked, and there before me was a pale horse! Its rider was named Death, and Hades was following close behind him. They were given power over a fourth of the earth to kill by sword, famine and plague, and by the wild beasts of the earth.
So, Death is a heavenly being, given power (by Yahweh) to kill. Is he evil? He's there for a very specific purpose, and as far as I can remember from the texts, expresses no opinion, nor does the text ascribe any morality to him.