Feeding is worse than trolling
I get to deal with both in my games. Sometimes I see a Yasuo ADC who forced my ADC to go top, and I'm like, "Okay, let's see what happens." And he goes 15/2 carries for everyone! You might call it troll, but I got my LP back, so I didn't care. I have a lot of "troll" setups myself that do really well. Mostly involving tanks with Lethal Tempo in the jungle. But I can carry with them, so no one cares in the end.
But then you got FEEDERS, on the other hand. You can have a Miss Fortune ADC with the right runes, the right items, the right everything, all by the book. But if she goes 0/12/2, then she can fuck right off, cuz she ripped the LP right out of my hands and left me to rot.
So what do you think? Would you rather a troll force you out of your lane unwillingly just for him to carry the game, or would you rather have a real "honourable" teammate who goes 0/12/2?
Think about this being in ranked.