Flamers and Feeders

Could someone explain me why is flaming worse than feeding to the community? I honestly do not understand it. Why do flamers get banned so damn fast but no one is doing anything to feeders, who are pretty often the reason for flame? If you are going to answer me that feeders have a bad game, please tell me how is that possible that there are a feeder in approximately 70% of the games. (Atleast in my plat elo games.) Is this thing just part of the game which everyone should accept?
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