My comment is partially based on someone else's thought from a prior post. I don't think anyone will deny that Carrie is definitely a victim of horrific abuse; not only by her mother, but by virtually everyone else who has ever come in contact with her. Does this abuse justify the total havoc that Carrie creates, courtesy of her TK ability, on most of the student body and the entire town?
I was trying to imagine how the story might have developed had Carrie not "erupted" after the events at the prom. For instance, she might have developed individual plans-of-revenge for each person she felt wronged her and gone about her destruction in a more subtle manner. Looking at it from the psychological/medical point of view, had she lived, she might have become a "lab rat." You know, labeled insane and then institutionalized so that her TK ability could be better studied and documented. This could be much worse than anything she experienced in h.s.!
In some ways, I think King gives Carrie the easy way out in this story. She learns about her TK ability, but never learns how she might use it constructively. She's never punished for her actions, and she's never given the chance to become something better than her mother or how her classmates view her.