Why Riot doesn't do much about toxic people, in my opinion.
If 1% of the community or something like that is toxic then why should they worry about it? From what I've seen and I'm sure Riot has seen is that most of the time toxic people are shut down by the other players on the team, and sometimes the opposite team as well.
Its kind of like the community takes care of itself. Now afk and trolls, you can't do much about. But as far as people just being total assholes for no reason, Riot shouldn't have to take care of that if the percentage of the community that's toxic is that small.