After 8 years why are there still a fair amount of trolls in this game?

I want to personally hear from Riot on how a summoner named <removed by moderation> gets to keep his account. In our game we was intentionally feeding and trolling. You can look it up, my summoner name is notan03. I want to hear what is being done to stop this. In his match history this is not the first time he has done this which tells me Riot doesn't care about those of us who have to deal with people like him. It's people like him that cause me to take 6-8 month breaks from League. I take ranked seriously. I can handle losses. I can not handle losing free LP because of people who afk from game or intentionally feed because it is funny to watch others get angry. I want to hear solutions from you on how to get rid of these trolls. I've played this game for years and the fact that it is still prevalent all these years later is disturbing to me. I used to actually put money into this game buying skins and such. Haven't in I don't know how long. My philosophy is if you don't care about us the players, we don't care about you and supporting your game with money. 8 years and this is still a breeding ground for trolls. Unreal. I honestly don't understand how you still have a player base.

And I'm sure I will get the usual people stating "it happens to everyone so shut up" posts. My question is why does it have to happen to everyone? lol End of rant.