Toxic Behavior is a chain reaction caused by Riot. Let me explain:
Player 1 is having a good time
Player 2 is a troll/int feeder
Player 2 feeds, game is a loss due to that and Players 1,3,4,5 are slightly agitated. Player 2 tells the enemy team to report their team, enemy team reports everyone except player 2 because player 2 gave them a free win, simple as that. Now, player 2 having just been reported even if flagged has time to ruin 3-5 more games for people. This ultimately leads in already aggrivated people dealing with some bs mechanics Riot has such as overloaded kits and trash tier turrets.
Player 2 is still going strong on the feed montage, consistent games are being ruined. Other players start not giving a flying f**k in there games anymore. After 6 games, Player 2 gets a 24hour ban(lol) Now riot gets to deal with at least 10 more people pulling the same crap. Each day, every hour, of every game. This is how I became toxic myself, and did I want to be? No I truly did not, in fact half the time I yell at people, I feel terrible and wish I could stop but it does no good because even if I do stop yelling at them, or I don't say anything at all, I still get reported because I didn't ward mid lane while I was in bot lane.
The game is trash and it's unbalanced, and I'm quite glad I uninstalled it feels like a weight has been lifted off my shoulders.