Yeah - if you have the character concept of moving from the dark side to the light I can see where some players would be frustrated because this change seems to stand in the way.
I have the opposite reaction to frustration, this totally fits a character I want to run, and I liked the idea that if I took Terrify it would mean he would have to work harder *forever* to redeem himself and stay that way.
Exactly. This makes the journey that much more interesting and meaningful.