“beyone her chornological age”.
The above phrase can have many contexts. Physical, sexual, psychological, moral.
I think that an adult who is seduced by an underage girl should not receive as dire a sentence as one who forcibly rapes a girl of the same age.
We do not know exactly what happened in this case. There were only two actors. One is dead. The other is under legal threat. Unless other information is available, I am withholding judgement from what the judge did.
If someone puts a steak in front of a hungry man, who is forbidden from eating it by law, they may be guilty, but the person putting the steak there bears some guilt as well.
But the story started a lot earlier than this. The rape of the child happened in 2008, but as early as 2004 the school had already issued a warning to Rambold to avoid touching or being alone with female students so they knew something was up. Then, after his initial arrest for the rape and pleading guilty to a felony count arising from the case