". That said, playing NCAA sports is a privilege, one he was certainly aware of at age 15, and if the knowledge that conviction of sexual abuse would deter another boy from making the same choice, I think it is worth doing"

That is a totally bogus argument, to suggest that this could in any way at all act as a deterrent to stop young teens from committing sex crimes.  And again, let me restate, that you come across as lumping all sex crimes together, and demanding severe punishment for all offenders, no matter the severity of the crime.   Asking for his career in baseball to be ruined only comes across as being vindictive, and nothing else.  

This offense happened 5 1/2 years ago, long before he joined the Beavers team.   It is thus a totally inappropriate analogy for you to compare this case, with cases of sex crimes & allegations made against adult men already playing for either the Beavers or Ducks.