cuz there can't be a game without you that isn't an auto-loss so even if you're complete absolute dog shit we still need you
i don't get to have any real diversity with melee carry bot lanes because you do everything they do but with the added safety of range and no real drawback to most of the shit you have; almost no ADC is actually fun to play around at any stage of the game, but I'm still shackled to you even when you're feeding because you're the most likely person to tilt and throw the game on a whim, especially if you're Vayne.
i give people the benefit of the doubt, but as a general rule of thumb i don't get chummy with them