negativity bias is getting the best of you when it comes to premades.
you only or for the majority meet toxic and bad premades? well obviously that's because premades who don't flame and blame have no reason to tell you they are in a premade, I have played about 3-4k games across all game modes, have reached gold in ranked, not high but it's something and I rarely see a premade who literally blames and flames me for every little thing in existance, on the extremely rare occasion that it does happen I mute all 4 of them, play the game, they report me 4 times and nothing happens because I didn't do anything wrong and 4 reports don't screw you over.
this is exactly the same as when everyone were complaining all french are terrible human beings, or russians are all terrible human beings, why? because you only notice the one's not typing english much like you only notice the premades not behaving normally.
everyone just needs to calm down and not let their opinion be so skewed because of the bias towards negative premades.