Toxicity and suggestion
Riot punishes consistent negative behavior. I'm not sure what the statistic needed for punishment is, but I assume it's not straight forward.
Let's start by addressing when people do flame. I'd say 99% of the time somebody flames is when a teammate dies. It could be himself, or yourself, or another teammate dying. % of flames correlate with % of deaths. Also the ratio between the enemy kills and your team kills shows a correlation to flaming. So, when your team has a 5:1 kills over deaths compared to the enemy team, 9 times out of 10 no flaming goes on. On the flip a 1:2, 1:3, and especially 1:4 ratio begins to show much more flaming on your team's side. Rarely do I see flames with missed dragon or baron smites, etc.
Let's also look at specific 'games' that have flames. Losses are generally the games in which we'd see the most flaming going on. If you look at (especially in bronze or silver league) someone's match history, in my experience, if you look at only the losses, the magnitude of flaming is exponentially higher than that of wins.
So, why does the system even bother looking at wins when considering a player's level of toxicity? I understand flaming "can" still happen, but honestly it's not likely.
Also, we should take into consideration that not every player feels strongly enough to report someone for negative behavior... or they simply forget. Some people really don't care whether flaming is going on or not, and many /mute all. So they aren't communicating.
Lastly, I want to look at ways that players flame. Question mark pinging, blue dot pinging, and verbal abuse. It can be very difficult to concentrate when a toxic player is ping spamming you for mistakes or deaths. Making a recovery from a ping spam can be frustrating and even more difficult cause your focus isn't 100% anymore. You're now thinking about what that toxic player is thinking. Verbal abuse can range from sarcasm, deliberate name calling, calling out someone's skill level (bad), telling someone to quit the game, or asking condescending questions.
I wouldn't have written this if I didn't feel adamant about it. Toxicity in silver as well as gold leagues is out of control (I'm in gold league). I'd say almost every other game I see a toxic player either on our team or the other team. Rewarding 'good' behavior is simply not enough for toxic players to care. I'm not asking for permabans, in fact I hate the idea of players leaving the game. Simply, I think more temporary chat bans (text prevention) needs to be implemented more often.
My last suggestion is for the question mark ping. I'd consider changing it from a question mark into a "MIA" signal. It would still appear where the player places it, but it's a much more friendly ping than the condescending question mark. Cause, "what are you doing?" being pinged at you endlessly isn't fun.
Thanks Riot :3