This is my opinion and you can't do anything about it.
League is dead. I only enjoy it when I watch Qtpie and other streamers. You can't play in low elo anymore.
Trollers, feeders, intentional feeders, flamers, toxic people, people who afk, smurfs, bad matchmaking, no balance, people who ruin others games and not get punished.
All of those reasons above leads you to tilt.