sebille is a crazy elf assassin that likes and gets pleasure from killing and murdering people...
They did change Sebille quite a bit in the later EA build she doesn't just want to kill everyone on sight any more. Rather on one of her arms she has the names for all those who she was forced to kill. She didn't get any pleasure from that.
But back to the topic, I think that something like this will actually be in the game. As they always say gaining source from dead bodies is evil and will have consequences.