1 person waste everyones time, but i get punshed for leaving ?

In a normal game why should i have to stay if its going to be 20 min of trolling/no fun ? i played over 40 normals and i have never afkd. But i feel like riot NEVER adresses the ROOT of the problem. Like a teemo can feed all game and go 0/25/0 and i will get banned for leaving...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................