Barr is naive if he thinks his display of rationality and objectivity is going to win over any on the Left. They will perceive this as weakness. The only thing they understand is strength and resolve to oppose them.
You missed the point if you think he gives a damn about winning over the left. He only cares about enforcing the law, regardless of left or right.
Win over the left? Barr is a honey badger. He don’t give a damn. As he said, he is at the end of his career and everyone dies.