Harassment
Honestly, does anyone ever get punishment when they spend an entire game berating another player?
Maybe we'd have a better community if there was something done about those who make the game more stressful and frustrating for others.
Even if you're winning a game and carrying a team, there is always someone who is willing to just tear into you. There's no reason for it. When I see people do that to others, I try to calm them down and stop them, but sometimes it doesn't matter. I feel bad for those players who are already doing poorly but are just being attacked by their own team. If Riot wants this to be more focused on the teamplay element of league, then maybe cracking down on those who contribute to this unhealthy environment would help.