he doesn't
Karlsson is an awesome and elite player in this league, every GM would want him in his team, and nobody can deny that. But I just find it sad that the one trophy that is given to the best defenseman almost always goes to the one who scored the most. Was Karlsson season good? It really was, specially the 2nd half. I don't understand tho how his 6 extra points he had over Subban is considered a better season, considering PK had way better overall game (pretty evident when you watch both play, and confirmed by advanced stats), better 5-5 production, and is playing on the pk. And that is only between the 2 of them... since like you said, guys like Dougthy and Weber have been much much better overall defenseman in their career so far, and still haven't clinch a Norris and Karlsson have 2. At least Keith has won it twice in the last few years... there is that.