Ok, but I still don't see your point - we do know all the facts of this case. It is incorrect to say that 'only the judge knows'. While in some cases the judge's determinations on issues of law may be hard to understand for the layperson, the determinations of fact the judge makes are not really in a 'professional' capacity as you have suggested; the judge makes his determinations of fact like a jury would - namely by deciding if, on the evidence presented, the charge has been proven beyond reasonable doubt.
No element of a judge's decisions on fact, or on law, are inaccessible or unfathomable to the general public.
I think LPH was referring to the sentence handed down.
A sentence is definitely a 'professional' determination by the judge. The jury has no involvement in that.