It's hard to understand, but in the long run to be honest with you it comes down to money. Bronze silver and gold hold the majority of players, it is also one of the most toxic environments in gaming save dota2 or csgo. But to direct to your inquiry perma banning players in that range won't ever happen on a large scale, it's where riot gets the bacon.
Larger issues with the subject you bring up with reporting and things that should not exist in LoL players who are in flex getting mass reported by premade 3s. With the way report system works, more reports on 1 player looks worse then 3 players with 1 report from the other player in flex. Simply put being attacked by 3 different players with segmenting the conversation into 3 separate reports making it near impossible to fully justify reporting any specific player of the premade trio. The solo player on the other hand when reported has all of theirs in one.
I myself do main support, as a result I am flammed on 80% of games I play ranging from bronze to silver. Try as I may to be the best support to a bottom carry, no matter of logic or pain has shown any sign of progress in the ranking bronze into silver. Plays janna support, gets the adc fed, welp top and mid and jungle all failed, fed and now blame support. Guess who is probably premade.
Honestly they need to start banning toxic players, I myself even fall into this term according to tribunal. If banning is to strong and would hurt player base, at least remove them from ranked. If you swear 1 month no ranked, if you go 0 12 0 as a carry 1 month no ranked, in the end it won't change. League is geared for top tier play, not low mmr or elo. So enjoy the game, cause what is the point of playing if every game is full of trolls, and feeders wait..... isn't that every ranked game .......
