Harsh Behavior can be ignored, avoided, and dealt with in LoL.
Please read before jumping to conclusions.
It could be because I have developed thick skin over the past years, and I do expect some downvotes, but I personally don't believe that aggressive player behavior is a problem on this game. I have always had the luck of encountering people in matches that would condemn me, threaten to kill me, insult me, call me every racial slur in the book, and very few people seem to know the coping mechanisms that I've come to gather.
Firstly, this is a game. So long as people are behind their keyboards instead of right in front of you, their true colors will show. This isn't real life, so we shouldn't expect carebear treatments and blanket rules that can compromise the social community. These people who get angry, troll people in chat, etc, they really don't have much to stand on as far as their superiority goes, despite what boarders they have. Don't let them get to you.
Secondly, the way that I look at it when people insult me or provoke me, is simply that it's funny. There's nothing that makes them more angry than you finding their insults or threats humorous. Nothing that makes them more angry than seeing that you're more level headed than them when they're yelling at you.
I'm sure that the question is about in the heads of many on why I don't see this as much of an issue. There's two reasons. The first one is that there's bad people everywhere you go, every game you play, and it's important to learn how to deal with them (There won't always be a report button for people that upset you). Secondly, with the new map out that causes FPS lag, exploits, and the increase in bots, hackers, and trolls (people that compromise the game), the focus should be on fixing these things so we can get back to playing the game instead of shifting the focus to people calling someone else a poorly-made insult.
I hope I brought some insight, and I hope that I brought some understanding.