Having lived through extraordinary childhood circumstances, Robin has no conception of the moral difference between right and wrong, only between what is legally permitted and what is not.
Statements
causal (having been X, Y)
Living through a crazy childhood caused Robin to have no concept of the moral difference between right and wrong. He only knows what's legal vs. illegal.
historical fact
Robin committed an offense, knew it was illegal, but didn't know it was morally wrong.
Evaluate
The Overlapping Ideas are "right/wrong" and "illegal/legal". Can we figure out any way to synthesize those ideas?
The last sentence doesn't seem to add anything we didn't already know. Robin understands and was aware of illegality, but he doesn't know or have awareness of immorality.
We could say something boring like, "Apparently right/wrong doesn't perfectly map onto legal/illegal", because if they were one and the same, then his ability to know legal vs. illegal would mean that he effectively does have a concept of the difference between moral / immoral.
Goal
The correct answer will probably play off the distinction between right/wrong and legal/illegal. Or it might address the causal connector in the first sentence, which indicates that .