No consequences

The majority of players like myself in this game are lower elo (silver/gold) so we regularly deal with mother fudging afk tunts or some fudging sugar head who ints because he lost his lane. Why hasnt riot implemented a perma ban system from ranked games in that season for people who do this regularly ? At the moment there are next to no severe reprecussions for people who do it so it doesent bother them to rq a game etc .

Is it harder than it sounds to put in place or something ? Like it just seems like a logical thing to do .

Yours faithfully- A salty person who may lose another promo due to afkers