I always thought Arcanum's story was about death, human lives and ideas beeing fleeting and mortality and pain. It is the main theme that runs from the first quest you find in the game and if you combine Loghaire (who is neutral observer on the matter), Virgil (who is positive) and Kerghan (negative) speeches it seems like it repeats itself in sort of secret holy trinity.
Or maybe it's all other the place, but after Virgil's resurrection it always clicked for me. He is probably the most important character in the game, even more so than the villain and always echoes everything that happens including talking back to Kerghan in the end.
This is a good argument to remove the karma metre from the game. Evil Virgil never dies and you don't get to hear his perspective on the matter, which is pivotal in your understanding of the flaws in Kerghan's logic.