Why Riot never deal with feeding players?

I got a game playing Darius today and I totally destroyed top lane. I got 8-3-0. However my team has a 1-7-5, a 4-10-3, a 3-11-0, a 1-6-6. Some of these are intentional feedings. I don't even feel that I met with team at the same rank. It definitely has some ranking issues in this system. Did anyone feel the same thing that your team is weaker in most time than the opposite?
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