Got a link? If that's true, it would have been the prosecutors job to pursue certification as an adult. The judge can only rule on what's been presented in court.4 counts of vehicular manslaughter meets the criteria for being tried as an adult.
I was involved in a felony case 13 years ago, and as a part of the presentencing I had to write a letter to the judge expressing my thoughts towards the perpetrator. But that's just procedure and judges can't rule by emotion, they have precedence and laws governing them.