You're the one who asked, Wolf.
Perhaps, but you're pressing it.
Ok fine, here is how I see it. Your view on the matter is without foundation. You don't know how I plan to play such a character, nor do you bother to ask. You've forgotten to take into consideration that what a person could do is not what they will do.
A wizard could throw fireballs into the crowded street. That does not make all wizards nor spells evil. A man could stab an innocent newborn child with his short sword, but not every man who picks up a sword is evil. But because I choose to use a tactic that doesn't harm the target, I am some "twisted" person. Did it not occur to you that charming or even dominating a perceived enemy is just as good, if not more so, than simply striking him dead?
As for thralls and believers, the whole affair seems to be rather involuntary, or at least it can be. The thralls and believers come because they're psychically linked with the Thrallherd. It isn't as if my character has control over who answers the subconscious call. How she treats them, however, is completely up to her. While many people may abuse this special connection, others will treat their thralls with kindness and respect. I charge while Thrallherds could use this as a parasitic relationship, they could just as easily turn it into a symbiotic one.
Honestly, to compare my character to a brain-eating illithid, zombie-crafting necromancer, or satanic cult worshiper is quite a stretch and a little insulting. Your talking about beings that sacrifice people, even souls, to their depraved gods for perks and thrills.