Perma-Bans
No amount of perma-bans will make shitty players any less shitty.
Shitty players make others rage at them, by virtue of being shitty.
It's just a fact of life. The everyone gets a trophy mentality is a joke, and these are the kind(s) of people who won't ever succeed in life. Criticism is a necessary part of life.
Also, when I figured out it was easier to spend $20 on new account then spend $ on rp for champs/boosts, I stopped paying riot a dime. EBAY ftw. Getting refunded all my old RP purchases through paypal was also a snap. Remember kids, there is always a recourse. Riot is shooting themselves in the foot with the new system. Perma-bans for trivial stuff? Lol. The money train is going to grind to a halt when people realize all their crap can be taken from them. If you don't want negative attitudes in your games, remove negative players' chat capabilities. The reality remains, however, that no amount of negativity makes them any less skilled at the game, and shitty players SHOULD feel shitty for ruining the game for their four other teammates - which is where the vast majority of negativity comes from in the game from the first place.