Originally Posted by Makaveli
So you're sympathetic towards the girl?
He's/she's pointing out how the screwed up actions of the girl were likely the result of her screwed up mindset likely due to a variety of reasons (ie: adolescence, unsettled mental state that could vary between mild and deep-seaded issues). It's not sympathy; just an attempt made at understanding how such a situation could arise.
This is assuming that the factors likely to come into play are indeed there. If they weren't and she was just some deeply amoral psychopath then, well, it's still a good thing she'll be locked away.