In my whole League career, I had 3 (THREE) trolls on my team

this is true. been playing since season 3 and the only true roll was an cdr ashe afk in base spam ult. did this whole game. not a word from his was said.. ever... and all his past games where the same... people mistakes trolls for people who lose lane which is retarded. or they flame them/let other teammates flame them and wounder why they snap

Honestly sounds like you just haven't noticed them. Even if I left out intentional feeding, I've still had more trolls than I could count.