Letting Players Police Themselves

I don't understand why RIOT even needs a reporting system (to a panel) for players. It seems to me that they could implement a way for players to choose the type of players that they are willing to play with... simply put, they could have a filter at game selection that would allow each player to opt out of playing with any other players who have X amount of negative reports in the past 25 games, or similarly, they ONLY want to play with players who current have a ribbon of some kind.

Players who do not have ribbons, but also do not have many complaints, could potentially get put into a game with ribbon holders to boost morale and hopefully work on earning their ribbons, but there would never be more than 1 or 2 non-ribbon players on any team.

I feel like this would go a long way toward shutting down the toxic environment with players who freak out when they aren't winning in ARAM and probably get more players to use the honor system. Let the players police themselves and I believe the community would be much better off....

Maybe there is something about my idea that is just too terribly flawed that I don't get...