Why riot let trolls troll?

I would say about 80% of the games im having in league nowadays contains troll no matter what they do but we all know they do it intentionally, riot please why cant we have something like overwatch in cs to determine if someone is trolling and slowly but steadily get rid of the players which obviously are playing only to waste the fun from others? The state of the game right now for me is unplayable at all i'm loosing all the joy , Your game is sinking due to your community and i don't see any steps in the right direction, maybe it's time to finally give up? And don't let myself have any hope that finally you'll do something with the health of your rankeds? Regards
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