Banned for "negative language"

Preface This is no appeal for pity, outrage, or discontent... I am simply making a thread showcasing my perspective. League of Legends has the complete right to make any decision with "our" accounts they choose.
I have played League of Legends for most of a decade, I was Bronze in season 2 and Plat by season 4 and have maintained playing the game more casually since. The system has certainly become far more hostile against negative attitudes and speech, this is to the point that I, a player or nearing ten-years has recently received a permanent ban. My account has little to no leaves in the entire time I have played the game, speaking of thousands of games and possibly one intentional-leaves several years prior. I never in-game grief, leave, or threaten, though I do find that this was almost widely accepted as part of the game in past years.
My primary gripe with my ban. The reason I was banned is purely based around my verbal treatment of a master Yi and potentially more individuals prior, none of these individuals muted me. By no means did this players take any form of action to stop my verbal treatment yet would rather envoke consequences against me manipulating the report system, which is by indefinite means far more harmful than my words. I called a Yi a "farm whore" and called him out as someone who "suicides, constantly" (he was 1-12-3 by the end of the game). At any point who could completely negate my negative impact upon him by muting me and would face no consequences for doing so.
Why I think this is poor and harsh practice All of my negative impacts could be completely negated by the already in-game mute button. You can argue that this allows for me to make individuals tilt initially, though I can argue their poor play prompts my tilting. Maybe I am verbally toxic, why not permanently mute me before you ban my account? Well... the reply I got was, some of the players they gave permanent mute would troll in other manners. The issue is, I have no history of expressing my anger through anything but text. Installing a system which allows individuals who have no previous altercations with the ToS i.e. leaving, griefing, inting, etc... Are placed in indefinite mute, this would allow for those players who do not cause in-game issues to be allowed to play the game. The Actual Outcome as of Now As of now, I am forced to play with lacking players on a smurf account to eventually make it to the same state as my main account. This is most likely the case for many players banned. The poor skill of the players I am "forced" to play with will most likely prompt me to be far more agitated. This is due to the removal of my MMR which I cannot truly reobtain till lv 30 or higher. The outcome is I get turned further towards toxicity and League of Legends potentially loses another player.
Thanks for your time, I remind that this isn't an appeal to pity or to envoke anger, just a "viewpoint" from someone that you do not have to read, if you do not want to... Thanks again.