The 1% of players are trolls claim.
So I decided to start keeping track for a while since Riot always claims it's only 1% of the players that cause problems, and they claim that my seeing significantly more than that is just my mind playing tricks on me. So after making a log, I found that a little over 21% of the players I get paired up with are toxic to the point of deserving reports. 60% of the games I played were ruined by trolls, since they ended up wanting to argue/grief more than they wanted to play the actual game. This is far from the stats that Riot has posted before, and even after sending the log to Riot support, they don't even seem to care. So it looks like this is how things are going to be. Garbage community that Riot just lies about and when you prove to them it's really that bad, they just ignore you :(
I think we need to make it a serious point to tell them that having at least a decent community is extremely important for the longevity of the game. If you keep letting people go down these roads, sure you'll still have players down the line, but they'll basically all be trained to not even type anything without flaming someone, and all the people who prefer reasonable communication will go play something else.
Edit: Why come in here and downvote everything I say and just leave without explaining yourself? You're undermining the entire point of the forums.