I'm not copmletely up to snuff on my eldar fluff; but the way I see it, the eldar cycle of life is kind of like hinduism. You see, the eldar overcome the many challenges of life, and in the end they join the infinity circut, where they have all eternity to meditate/think/rest, kind of like the hinduism, where the final goal is achive a state of nirvana (or enlightenment) where you have all eternity to simply ponder, or think.
If the infinity circut is representative of enlightenment, then wraithguard/lords are (as many have put it) abominations to society; as you aren't grave robbing, but you are instead pulling souls out of an eternal state of bliss so that they may fight for you. In short, Wraith-constructs deny eldar souls the right to achive the main goal of their society; an eternal state of non-life.
When you look at the path system the eldar have to control their emotions, it really supports my theory (IMO), as each path represents a challenge of life, and when you finish with your path, you are 'reborn' into another life (another path). Just like in hinduism, where you are reborn after death, and the main purpose of your life is to transcend the endless cycle of birth, life, and death, and reach enlightenment.
Anyway, I could continue, and get more in depth on the eldar-hindu parallels, but that takes me far, far off topic, so I'll end with this: Eldar are saddened, if not ashamed by wraith constructs, because such soldiers are contradictory to their whole spirituality, as the dead are denied what they have earned - enlightenment.
- Xander
PS; Let's hear it for the revamped boards! Hip Hip HOORAY!!!