Oh dear, who let the guy in the tinfoil hat in? Besides, we all know the developers of TES are all occultists who sacrifice a few virgins before every release of a new game to guarantee success. And they obviously have ties to the Illumnati, the Free Masons and the Church of Anton LaVey. All the demons in the game are modelled from actual demons that they conjure up in their basemant. Sigh, I love those evil bastards. Wish I could get a job there.

Anyway, using soulgems is not as bad as it sounds. Yes you do trap something or someone's soul in a crystal. However, when you enchant or recharge an item you are actually freeing the trapped soul and the energy that is generated by freeing the soul is what is used in the enchantment, not the soul itself. Well, that's what I tell myself anyway.
