Riot is against toxicity, but won't fix toxic inducing problems.
Lets face it, I doubt any of us will actually say that we are toxic people. I know a couple of fellow league players and they are genuinely nice people, but all of us have a flaw...we want things to be fair. How many of us became toxic when we lost to a mirror matchup? I doubt a lot of people can, because the answer to the question "Why am I losing?" is simple, they are just better then you. They farm better, they have better poke, they plan ganks better, they utilize their combos better, or their build is better. Nuff said. But it's when you play against a match-up that feel unfair that you get toxic, and their are A LOT of champion that feel incredibly unfair.
Lee Sin gets to do everything, build one damage item and then build tank and you'll generally be able to 1v1 the adc
Annie feels unfair because she has lots of damage, lots of range, all of her abilites are either target or with a huge AOE, and she has an point and click instant AOE stun in her kit that also deals lots of damage.
Darius has an incredible amount of damage plus DOT and has a strong heal in his kit
Fizz can get a Zhonya's for free by Level 1 (usually gets it by level 3). Except it's even better then a Zhonya's, He can control when he comes out of it, hip in a direction, release AOE damage, and can even be used to hop over walls, or to just gap close
We all know that these champs are in general unfair, but I want to draw your attention to a toxic champ that doesn't get a lot of attention.
Sona...Freaking Sona. Take a Spelltheif's Edge and go bot lane or grab a Amplifying Tome and go mid and you'll end up doing the same thing which is getting anywhere near the enemy and pressing Q and watch and the enemy flees in terror and two blue bolts of lighting fly their way to poke them for quite a lot of damage....and it's absolutely free. Her Q scales at 50% AP which is on par for most mages, has bonus magic damage scaling at 20% Ap on her next auto, and the only requirements for landing it is proximity and mana. The rest of her kit just makes it worse. Even if you grab a pair of boots you won't be able to out run her because of her E. You can try to poke at her from range but her W gives her a ton of sustain You can call for ganks but her ult will ruin it. She'll grab a few AP items and then rush Athene's Unholy Grail so that she never runs out of mana. Last I checked, her role was Support, with mage as a secondary, yet her entire kit is just perfect for a solo lane.
Can we get something about this changed? Really the only problem is with her Q, it needs to have a nerf on it, tune it back to like, 30% AP, or have it NOT prioritize champions so that it's harder to spam in lane, make it shoot only one bolt idk SOMETHING