Feeding/Trolling in Ranked games

Is it just me wondering why isn't there a system, that prevents you from losing LP if someone feeds your game? Something similar to the Remake system and making much more sense than someone losing LP because his client crashed. So if someone goes on a feeding spree his team can choose to report him, making him take the full extent of the loss and preventing them from losing LP because they had bad luck... That would make ranked games much more enjoyable, much more fair and make people think twice before feeding. It will also expose people playing on shared accounts in an ELO where they don't belong.
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