People who don't /ff 15 or 20 in clearly lost games are part of the problem
No, I am not one of those idiots that say 'ff15' when we lose first blood, or if I lose lane and our jungler isnt in a position to help. And I don't lose my temper when the score is for example 0-5, as 5 kills is a small dfference and kills aren't everything.
But something that is important to realise is that not all games can be won, nor should it be expected. When your bot lane has gone 0-15 by minute 10, your mid laner keeps disconnecting and reconnecting and spends more time in the fountain the and your bot lane decides to give up, its over.
Yes, it is technically winnable, but in the vast majority of people's opinion, it is not worth the effort. It's better to just end it and try again in the next game. And yet, these people that lost their lane hard and blame the jungler, flame hard and refuse to follow pings/advice also refuse to ff, effectively holding the other 4 players hostage in a game that is finished. It has to drag on for another 10-15 minutes. I think this is the main cause of people losing their temper; being forced to stick around in a shit game with people with a shit attitude. At best, we will farm on autopilot, alt tabbing. At worst, they will afk or start trolling as well.
This fallacy that we sign up to some sort of pseudo agreement to stay until the end of the game is a lie. I don't know who the hell came up with this idea but it promotes bad behaviour and loss of people's temper. I am older and wiser now and understand it is just a game at the end of the day, so I don't get angry. I just ignore my team and play on auto pilot.
Personally, I think the ff15 threshold needs to be 4/1 to surrender as well as ff20.