How to fix the troll system.
Make this game pay to play. Purchase your account for $5. Most of us laugh that money away at skins. If you're too young, I'm sure your parents would spot the $5 for your account. And if you troll and get banned, bet your mom and dad aren't giving you another $5!
I'd pay $15 a month to play this game, especially if it weeded out the, "LOL THIS IS MY 82ND PERMABAN, RIOT FINALLY GAVE ME AN ID BAN" players.
You wonder why companies like Blizzard are so incredibly successful and can produce 6+ different MMO's at the same time.
(P.S. They fired Ghostcrawler for a REASON) Why hire him?