What is happening in the last time with the trollers?

​In the last games I'm running into troller after troller. Why you let your community to be so toxic, is that the real community RIOT wants for it's game? I just can't understand, I wanted to have a nice saturday experience, playing a nice game I actually like in the few free hours I have and I runned once again into a troller how admitted to be trolling in the last few games.

Why you don't implement a spam like naive bayes alg. for trolling chat and make a combination with an AdaBoost or ID3 with the score the user has and its movements on the map. Just ban them 7 days, 14days, 30days, then give them a permanent ban. I mean even one developer can do it in 1 month and you can train the system on the accounts banned for trolling, if you have at least 200 banned for trolling.

PS: I'm expecting this post to be deleted, but I must write my frustration somewhere, even if the problem won't be solved.