RIOT start banning trolls please

RIOT start banning trolls and other people ruining games for us. I do not get it why these people are allowed to continuouslly play ranked games without getting banned. And they smile into your face while feeding enemy team and trolling you. I am SO frustrated by this behavior. So many people playing ranked to pull you down. Can you RIOT start think about this and somehow improve this side of a game? SOMEHOW. PLEASE. There must be a way to teach people that if they do bad things they will be punished. I do not get it.
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