It's been awhile since I've read it, but I thought it was pretty clear that Celia is the kind of person would rather watch someone die if the only way she could stop that from happening was killing the person who was doing the killing. Similarly, she see's all deaths equally bad, and thus people should be revived when possible - that some people are much more likely to go on to kill several other people either doesn't enter into it for her, or doesn't change her idea of what is right.

My impression has always been that though Celia is well-meaning, we were never supposed to be fully in support of her views, nor fully opposed them.