My bold:
In another case a care worker who was engaging in sexual activity with an underage girl in his care was not sacked because he may not have been aware it was wrong.
Mr Sadd told the inquiry that the following justification was given to a subsequent investigation: "He was not dismissed because in 1983 there was a lack of clear guidance given to him as the role of a house parent."
This is even less believable than 'the dog ate my homework'. The word 'may' in that is excuse-making, there was no definite finding that he did or did not know. 'May' is an assumption.
In the 1980s, and even earlier, an adult having 'sex' with a minor was known to be illegal, and an offence that could lead to imprisonment. 'May not' has no validity here.
But the role of 'house parent'? Again, even back then incest was known to be wrong - and someone assuming that role of parent, is expected to behave as one, not act like a predatory fucker. The title gives it away. So anyone not aware of how to behave like a parent, should not be in that role. It should not need explaining, nor should any 'guidance' be required.