is there a concept of teshuva in judaism? if a guy does something horrible but then does everything the Rabbis tell him to do, can this always be thrown back in his face?
Yes, unfortunately with these type of things it can.
He can never work around children anymore, most have to register as a sex offender wherever they go etc.
and im sure people will say once an abuser always an abuser...
but theres more to every story then that. there are times that its a one time thing. if rules are put into place that he never has a chance to develop a close relationship with a teenage girl again coupled with therapy then he is not a danger to the public anymore and shouldnt be on the wall of shame (in this specific case)
beyond this specific story, i think that the only names that should go on the wall of shame, are people that are currently a danger to children. otherwise its just tabloids and fodder for gossip and that has no place in a jewish run org.
How are you to decide who is currently a danger?
Unfortunately with this type of thing there is safety in people knowing.
Especially in a world where people are hesitant to press charges and things are kept hushed.
You know how many people who were accused of something moved cities and started working in another school all over again?
Plenty. It happens all the time.
How many other crimes that you commit follow you in the same way having to register as a sex offender does? Not many.
There is a reason for that.