Player Behavior community is to blame for the recent increases in AFKs and quitters.
Riot with their punishment system, and everyone else in these boards who automatically downvote anyone who posts anything except glorifying punishments and the punishment system, are the sole reason to blame for the amount of AFK and quitting increases. When the pussification of this community makes it where calling a teammate "poopoohead" can result in a permaban because this community is a bunch of thin-skinned easily offended liberals, it's best to just AFK since it takes probably 15 to 20 instances of AFKing to result in a permaban. It's also rewarding because it gives you a chance to use their own report system, that these same idiots glorify, against the players who get pissed off that you AFK'd and rage in chat asking for reports and not only cause them a loss but get them banned as well.
The entire report system which punishes chat needs to be removed (INTING, LOSING LANE HARD, AND STRAIGHT TROLLING SHOULD BE PERMAS) and people need to start utilizing mute. People would not leave the game as much, you asked for this people of Player Behavior.