Or... temp ban trolls and inting players. If they repeatedly int/troll ban permanently. Do this, we don't have so many flamers because they are not stuck outplaying jungler camps while their team feeds for no reason and won't listen to the fact that they can just ff at tower, stall the game, and win if they are willing to not suicide force outnumbered engages vs the people they fed all laning -- as though they are going to magically outplay people who kicked their butt all game now that the enemy has lvl and item advantage. If people who don't understand this were not continually put in matches with teammates who understand something this simple, then the teammates who have some actual macro and general game intelligence wouldn't flame their teammates, because they wouldn't be stuck explaining 8+ times (nicely at first, then angrily after team ignored 3+ times and keeps suiciding) what team has to do to come back and win. I swear team's ignore until too late, listen for maybe 1 fight (and wow you win that fight) then go back to ignoring and throw to give enemy team the winning push. So yeah, temp ban is not too harsh and SHOULD be getting used more on inting/troll players who get reported. And don't reply with bs "you can't know if it's a bad game or trolling/inting". The only people who cannot tell the difference in most cases are boosted trolls/inting players.
If you force fights 2v2, 1v1, 3v3, or whatever and you lose on even items and levels, you are not going to win them when down in levels and items. Make that mistake once, I forgive you. Make it twice, you annoy me and I will tell you to stop forcing fights because you clearly are not smart enough to recognize that simple truth on your own. Do it 3+ times and it is no longer possible to claim it is a "mistake" and you are having a bad game --you are either trolling/inting or very very boosted. Either way, you need to be knocked down a few tiers so the skill at which you play matches your rank and so you don't screw over teammates who actually deserve to win more than any other player in the game but cannot because they are 1v9 or 2v7 with one net neutral teammate.