Why all the hate on premades?

People assume that if there's a premade of 4 and 1 of them is toxic, then all 4 are toxic... what's the logic behind this? I believe Dynamic queue is a great thing. And I say it as a soloQ player. I would prefer being always matches with a 4man premade, at least I know that my whole team is playing seriously. If one of them is playing badly, that guy can't just leave or troll because the others will be mad at him. I prefer having 4 players that have some synergy than 4 random guys who don't give a flock about the other members. I have never ever met a toxic premade, I've met toxic guys that were premade with someone but most of the time, they aren't both toxic.
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