[cottonvibes]

well fadingz, what you said can only be applied to the first way I mentioned; when you're talking about "personal" value.

if you use a system where you value someone's life based on their contribution to the world/humanity; then you can at least sort people out without getting your emotions involved.

like considering someone who enjoys killing people as a bad person, and someone who likes to help people as a good person.
then because the second person who likes helping people would eventually have a positive effect in the world, you can value that person's life better than the person that just likes killing people for fun; whose existence would cause much greif to the family member's of the people he has killed.

using that way, i think you can value/rate people as Good/Neutral/or Bad.
and the Good>=Neutral>Bad


thats just my opinion anyways.. :P