Riot needs to unfortunately take a hard lined approach on 'fun for all'
Because the children in this game that thinks that afk'ing in the middle of the game and diving an entire team solo is 'fun for them' isn't fun for the rest of the team having to deal with it. This applies for all game modes.
Playing for 'fun' doesn't mean throw the game to where the other people that got matched up with you are forced to deal with your 'fun'.