Players shouldn't be punished for intentional AFKs

We just had a Maokai jungler who got caught trying to 1v5 jungle at 1 minute into the game and then raged at everyone, then fed all 3 lanes before rage quitting at 10 minutes. We all know this happens sometimes, but being that this was my 1 loss at 0lp in the division, I got demoted over the intentional afk when we still could've won. It needs to be like Dota where in ranked games if someone never connections or quits before a certain game point, that team doesn't get ripped a new one in their asses over that one player's behavior.

Of course you'd have to set if to if that player intentionally uses the Leave Game option AND would have to be doing that action pre 10 or 15 minutes to prevent abuse and so on and that player needs to be heavily punished for intentionally quitting any ranked game.

Obviously the idea is "well you shouldn't have been low mmr at 0lp and it wouldn't have happened hurr durr durr." but players shouldn't be punished over a rage-quitter. At least make the lp loss way lighter