Why So Trolling Community?

I'm new to this game but my experience so far is the worst of any multiplayer game i have played so far. 90% of the teams i get are full of feeding trolling abusing little kids , so i'm asking why? This game works with stats and stats can put players into categories so why do i get so many bad trolls? Why Riot doesn't separate those who actually play the game with those who only want to troll? Someone ingame said that Riot actually uses this situation in their advance in order to boost their actual customers. Can this be true? Is this game really pay to win?
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