Whats happening man? REALLY (First QQ)

I played a ranked game today from my friends acc(plat3). One guy autofilled and he had support role meanwhile I finally got my lane(top) after playing jungler in last 3 games. I was happy untill he claimed the top and he blackmailed me if I dont let him go top he would troll the game. I only only only said, "Do it, you will get reported" Then I picked my champ and alt+tab the pick screen.

Game started, I saw him picked darius with tp meanwhile I was vlad with tp. I thought he will play support darius but no, he straightly went top.

I muted him and went top lane, maybe I should have gone bot lane with a relic shield but I didn't. Maybe it was my bad but I didnt want a troll get what he wants. So we did 2 top lane and he was extremly bad.

our adc was doing fine at bot as 1v2, our jungler were doing good, everything was fine untill he started trolling and int. feeding. General score was 15-7 and darius had 6 deaths. He went afk, he started giving our info enemy team etc etc. He was doing everything he could to let us not win the game.

at the end we lost because of him. He finished game as1-16-4.

Tragic part is, at the end screen I saw my teammates wanted to enemy report me which they did. don't know why but my team blamed me for losing they said " You should have let him play top now we lost because of you". But why... Why people blame a innocent person for a loss?

Wtf is wrong with lol community? Is it happened on me because my teammates were also troll? Or they would do the same like darius did ?

Don't know what to do man. Im sure I get like 5-6 reports that game. Didnt flame, didnt even talk whole game from chat. Just were typing "...." from time to time and thats it.