Was never toxic to begin with. But, talking about my story.
I did get a first time lock after I returned back to the game since Season 2. Apparently, telling someone exactly how wrong they were and correcting them after a good 15 minutes of hearing them bicker, whine and blame me incessantly was my mistake. You can't argue back but only mute, report. This made me miss the Tribunal. Atleast, people reading chatlogs would know who is in the wrong and essentially, correcting someone didn't feel like being 'negative' to me. Toxic was a farcry. But it was, according to Riot because it led to an argument. Got a first time lock for being 'negative' and arguing when the game was basically over by the time I did start replying back. Also, I have noticed but you always get atleast 2 players who absolutely refuse to surrender. Its like their lives are at stake! So there was that, 2 guys wasting time not giving up while they have everything but our Nexus, 10k+ gold up.. while the rest of us sat there arguing.
I'm pretty patient but I find that its easier to play with everyone muted in the new setting. Because. No matter even if you are patient, if someone starts off and you respond then you are in for it. Every dozen games you get a clown who will make it a point to randomly pick someone to turn miserable. I just dislike the concept of listening to crap and not being able to stand up for myself. Was told by Riot that this is only applicable IRL, not in the game. Hah!
Next, talking about toxic players reforming. I'm sure that some actually do but for the most part, I think that they don't, actually. Just find ways to cope better without being explicitly toxic in chat.
And, there are countless ways to get around being explicitly toxic. Spam pinging someone's champ, for example. Throwing ?'s to tilt them further. Or just intentionally letting them die. Being sarcastic in a 'nice' way with smilies. Tarzaned is a good example of this one, if you watch his streams. Same with Tyler1. Watching streamers, I feel that toxic players never really reform. They just learn ways to get around it. I think most of them go nuts cussing out loud IRL to calm themselves down. Atleast, based on streams of previously toxic players I've watched. Like IWD/Wingsofdeathx etc.
Not to downgrade streamers, some of them are exceptionally cool and decent to their teammates even if they are messing around like monkeys (NOT RUSH). Like Boxbox, he's always cool and never blames anyone. Qtpie, Sneaky etc. Rush is just a monkey, I don't know what he types when he says something in korean but I think that he's pretty funny even if he loses, its entertaining.