Why are so many players stuck in low elo.

I just level 30 and play some ranked games. In first games ofc trolls , second game a bit more normally , third game again trolls feeders, now i play with a 9/19 teemo who fed riven the hell out ... Please do something bc this teemo just ruined 1 win from my placements. I already sent a ticket all the whole team reported him and get 0. Comments incoming : "Every team is carryble" , "Everyone have feeders" , "You could stil win that game" , "Not Teemo faults , you're fault" . How I should carry that game with silver / gold knowledge ?! Imposible ! I love every down vote !
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