Riot is banning the wrong kind of toxic players for all these years.
Riot should ban toxic players that uses sarcasm instead of players that uses straightforward toxic words like "I will fuck you mom." The reason for this is because every time when someone say "Go kill yourself" or "Have incest with your sister", it encourages me to do better. Also there is this one game I had in ranked a few days ago, I feed first blood to the enemy and our team's Sona said, "Stop feeding you piece of shit!" After hearing this I felt encouraged to not give any more kills to the enemy team and do better. But a few games later, when the enemy Zed who I was laning with went top and killed Teemo, Teemo said "Why is mid top?" After hearing that I got so mad at Teemo that I continue to yell at Teemo and say "I will bite your dick off if you continue to use sarcastic comments again you piece of shit." Then I went full tilt the whole game and we eventually lost. Straightforward criticism encourages me but sarcastic criticism triggers me so badly.
Before you write something, please note that this is all base off on my personal opinion and may be different with yours.