So there you have it. Naoko didn't do anything to receive the bullying. The 4 especially the guys were just complete monsters.
I mean obviously it's not good what Naoko is doing, but those 4 are the reason for her psychotic break and the fact she was horribly disfigured. I knew it wasn't firecrackers when they said it and I predicted originally it was some sort of acid.
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EonNite - I think it's more the fact that the reason behind her killings isn't her fault. If not for the 4, she wouldn't have had the psychotic break and gone on the rampage. I don't see it justifying her actions, but its showing that what she's doing was caused by a chain reaction caused by the 4.