Tabitha wasn't all that evil because she tried keep up her reputation, unlike Alistar who made it known he was evil too the core, his goal was straght murder. Evil is a to harsh a word to describe the now Tabitha to me,she was more calmer than Alistair because in a kinda sorta weird way she showed a teeny tiny bit of compassion for her victims, because if she wanted to she could have killed them already. she was more like a wicked psychic with magic and enjoyed watching and causing the people in Harmony life miserable, that was as far as she went, she never went over the top with it. Plus Endora soften her up. Now centuries ago is another story, she was very evil, my guess is she didn't have the Timmy she had back then.