Call me a cynical bastard, but it wouldn't surprise me a bit if the prosecutor wasn't just pissed off for a number of reasons: First, the kid wouldn't go for the plea deal; second, the jury found him not guilty on the phony "rape" charge. After that, he went for a vindictive kill on the thing with the younger girl. Prick!
Yeah, they're stupid kids with idiot parents and no real moral compass, but 10 years in the joint for pissing off some dickweed prosecutor?