The Founding Fathers anticipated just this type of overreach when they wrote in the Constitution that punishment for a crime must not be "cruel or unusual." The punishment should fit the crime.
Now we've seen numerous cases recently where teachers have sex with 13 and 14 year old students and get probation or a sixth-month sentence. Those are cases where the teacher is an adult in a position of authority; here, we have a case of two people in high school -- and he gets ten years.
He should have robbed a bank instead -- he'd be out in 5 or 6.
Sheesh, some of the comments on this thread sound more like sharia law than the U.S. Constitution.
Legislatures make laws, judges conduct trials and hand out sentences based upon law. The system for which you advocate sounds much more like Sharia than the one we have...and I support. Only under Sharia is a judge prosecutor, judge, jury, and executioner. We separate the functions.
If you don't like the law, change it...