Even when you assist the team
This is more a humanity problem than solely league problem.
Even when you make countless contributions to a team, for example saving a few teammates that over extended or you 1v5 the whole enemy team and win. still if we loose at the end of the game its my fault we lost. There was one time I pushed to by myself and took a tower while getting well need the gold. After which i came back and got a triple and missed the tank.
I ended 14/7/18 and the other guy 8/13/13 yet its my fault for winning my lane and help other lanes.
So idk what to do. maybe just mute the whole team. reporting these people seems to do nothing.
In the end,out of the 9 good things you done the 1 negative thing stands out and makes it your fault the game loss.