Although what Dunkey did was wrong..
His ban does bring up the subject of trolling.
Lately Riot has been focusing a lot on toxicity and that is great and recently I have seen a decrease in flaming in my games. BUT what I have not seen is a decrease in is the trolling and afking.
Most of the games that I have a flamer in I usually also have an afk in. The afk is usually the focus of their toxicity. I think that trolling and afking need to be taken more seriously and that they are the main reason for flaming. They are the essence of our rage.