Hmm, interesting, Gently, re: the contrasts.
I can see the line of thinking re: Beth. I suppose, if she does truly believe Ellie knew, rather than a knee jerk reaction, then yes, she could think Ellie hit Joe to ensure he never got convicted. I struggle to think that Beth would really think this of her former good friend, but I can see where the character would not be thinking clearly etc, and it is easier to carry on blaming than stop and examine the situation more closely, as then of course Beth would have to admit she should have known where Danny was.
But I still find it hard to believe the whole community, who all knew and liked Ellie as well, would all be thinking the same thing. Surely some of them would be saying 'hang on a minute...' To each other, if not to Beth?
I'm not sure it will end with Hardy being rubbish - more that he doesn't know who to trust. Wasn't the issue with Sandbrook that he was covering for another officers mistake (his wife?). And if he doesn't know Claire was involved (if she is) then he clearly can't be that good a judge of character.