They knew he had issues with young girls and they still ALLOWED him to go out in service, going to doors of strangers who had not only no knowledge of this man, but who were told that these people are "ordained ministers" which gives them a sense of security that was false-thinking that they represented a religious organization and had been in some way vetted by them to be decent human beings.
They failed when they didn't remove his publisher status. No (JW) sex offender that is known to them or can be known from police/court records should be representing (any) religion in any fashion.
Period.