Riot please

Riot please why are there people out there who are allowed to do this in ranked? why are trolls allowed to freely pick whoever they want in whatever role they want knowing that their gonna lose and end up losing the game. This vi, who had 20 cs by the 15 minute mark, and 4 deaths already is allowed to go into ranked, and freely do this without worrys of being banned because players cant get banned for off meta picks while they ruin the game for 9 people. You guys really need to do something about trolls, because all i see is toxic this toxic that while people like this guy roam free to ruin other games for people. And to clarify the vi was mid vs a kennen.