Riot, why can't trolls get banned from ranked at least?

I've just finished another fantastic night of playing ranked with all the trolls in bronze. I played my best and was polite all night but apparently my politely suggesting that our mid laner should build a zhonya's to help with not dying to Fizz was rude because my mid laner then called me a %%% and a tryhard and then came bot to feed my enemy laner a few times just to make sure my lane was just as screwed as his was. My team then lost a winnable game again, and then this charming mid laner then implored the other team to report me in all chat for feeding even though I was the only person on the team that ended up with more kills than deaths at the end of the game despite his best efforts to the contrary.

I don't flame. In fact, I use chat as little as humanly possible to avoid giving one of these gallivanting shitheads whatever twisted justification they need to promptly ruin a game for their team because they either identifies you as someone who cares about the outcome of the game or they find some bizarre way to take offense to a politely worded suggestion.

I have had exactly ONE enjoyable game with a team of normal people in this entire week. Trying to dodge all these toxic people and play just one game without someone griefing or flaming or both is like playing Russian Roulette with an automatic handgun.

Can we please suspend people from ranked if they get enough reports for trolling? Or better yet, suspend them from ranked for a month, remove their ability to get IP for that time period, and put them on probation where further bad behavior during that period immediately escalates to full suspensions and bans. Ranked should only be for summoners in good standing and people who are accruing bad reports should be unable to play ranked so even people in Bronze V have something to lose if they chose to make a bad experience for others.

Chat restrictions do nothing if you are hellbent on trolling and another option short of full suspensions and bans might be useful. I think an immediate punishment with some teeth for valid reports would do a lot more than a chat restriction and it can easily be escalated if the poor behavior continues. Whatever the system is now, it doesn't work, and there should be punishments a troll might actually care about because you don't need chat to cause problems and there is plenty of time to talk shit before and after the game.