I think it’s that mentality but also experience that sets apart the likes of Nigel Owens & Wayne Barnes from the rest.
I agree ... but ... Barnes tends to dismiss stuff with the 'I didn't see that' reply, or lets stuff slide to keep the game flowing, a little bit too much for me. There is be nothing wrong with him asking the TMO to check whilst the game runs on. Now, the last game I saw him do (not sure which it was) he was doing just that. So, for me, an improvement, where he was using his 'team' more. He had an excellent game. And as for Nigel, he used to get some stuff wrong, but he had a great feel for the game and it showed in the way players treated him. They knew he knew.
And I agree, Dickson had a bad game. That shoulder charge was an instance of where he bottled it. and as for the water boy incident, I too would have kept the penalty as it was, sent both off with yellows, and reported the club for action by the RFU. That would have been both balanced and fair.