Hit toxic duos harder
Duos that play together that have a history of toxicity when playing with one another shouldn't be allowed to play together.
Toxic duos need to stop.
[zombie-nunu-tears]
It's easier to set the mood, and destroy it, with the help of a friend.
Good duos are told in their End of Year review who they're good with. That's encouraging.
What is there in this game that actually discourages negative behavior? You do hand out bans, and thats great and all, but the damage is often done by then.
All of the features and good stuff about this game all take a moot point if you get harassed every time something slightly bad happens, or if you pick a champion that people don't like to see on their teams.

It's really a pathetic experience to have your faith in your top laner shattered because your bottom lane sent them on tilt, not to mention a great way to lose confidence and League Points.