Having read the article, I don't believe the judge is describing the defendant as hard-working and highly though of - he is pointing out that it is difficult to reconcile this man's good reputation with the sex fiend he was behind closed doors. He also refers to his activities as 'perverted'.
His rationale for not giving him a prison sentence is as follows: "If I sent you to prison it would be for a matter of a few weeks only, hence, as I say, the puzzlement that many people would have about that. The weeks you wound spend in prison would do nothing to stop you doing this again. My concern is for the future - the protection of other children."
I don't agree with the reference to seduction, it's always inappropriate in this context, but I do understand why the judge decided to go for prevention of future damage instead of assigning him to a short stint in jail with a higher risk of reoffending. What's baffling is why this prevention program is not available to him when he's in jail: the judge shouldn't have to choose between punishment and prevention, he should be able to provide both as part of the sentence. Child porn is horrendous, there should be better options available to judges to deal with it.