Not that it really makes the judge's decision any more understandable...
http://www.woodtv.com/dpp/news/Judge_s_sex_offender_ruling_questioned
21 March 09
Ottawa County Circuit Court Judge Calvin Bosman made the ruling for no jail time. In comparison to the hundreds of decisions he has made, Bosman says this was among the most difficult.
"Oh it ranks up in the, probably upper 10 percent, 14," Bosman told 24 Hour News 8. "I understand what he did was an extremely serious thing, and he got a real break.
"But I didn't do it because I wanted to give him a break. I wanted to do it because if there's any chance that he will be safe or the society will be safe from him, it will be better the course that I have given him."
and
"I agree with the prosecutor on reducing charges on many, many cases. but at times it hamstrings the judge to protect society in the long run," said Bosman.
If Staat had faced first-degree criminal sexual charges, then the outcome would have been different.
"He could've served life and I would not have had an option whether to put him on probation or to send him on to prison," said Judge Bosman. "And that would not have bothered me at all.
"The question is how do I best protect the public, and I think the course that I've taken in this case is the best course. It doesn't have to be the final solution. He himself will determine the final solution."
much more at link
(Note that the second paragraph begins with the word "Judge," which is clearly a misprint.)