So for those of you that have read the Sin War trilogy you know that Lillith seduced Uldyssian in an attempt to turn the mortals into a race of Edyrem (or Nephalem).

Zoltun Kulle was on a mission to basically do the same thing, but for the greater good of man, so he says.

So Lillith wanted to use the mortals turned Nephalem as her personal army to destroy the armies of the High Heavens and the Burning Hells; while Zoltun wanted to give the mortals the power to free themselves from the Eternal War.

My question is: What is the difference between these two different causes? And why is Lillith considered such an evil abomination while Zoltun just seems to be some dude that created a useful stone?