I don't disagree with your point. Murray said that the defender's helmet didn't touch his, but I'm pretty sure that it did. It wouldn't have been roughing the passer since a defender was already returning the intercepted ball, but would have been targeting I think.
Should have been targeting.
You cannot lead with the crown of your helmet especially against a defenseless player. Murray was trying to play tough guy. It's obvious the helmet is being used as a bludgeoning tool and makes contact with Murray's facemask.
But you know, just par for the course with Alabama getting the bulk of the calls.