Rubbish. I really, really HATE the mindset that "every game you lose is your fault" because it's such obvious bullshit. It's victim blaming.
LoL is not fucking Street Fighter. LoL is not even Starcraft. LoL is a TEAM game, which means you are responsible only for your own performance, but your own performance is NOT the only factor that determines victory! Yes, you can't just expect to be carried to win, but if you do everything right, don't make any mistakes and perform your role to a satisfactory standard for the level of the game you're playing at (you should NOT be expected to play like Faker if you're only playing a match in Bronze) then it's NOT your fault if your top Riven goes 0/7 before 10 minutes and your mid Cass goes afk because your jungle Tryndamere won't gank the enemy Zed for him and took blue for himself "for cooldowns". You can be 6/0/2 on your ADC and you're still gonna get fucking murdered once the enemy gets tired of kicking the shit out of your teammates because the game is not intended to be won by a single player. When this happens (and it DOES happen) you are in Elo Hell. You lose the game despite doing everything right and there was nothing you could have done about it.
Oh sure, you can say it was your fault for not being better than you are. You can say you deserved to lose because you're not Faker. Which is fucking retarded. And yes, you always need to keep trying to improve. But the thing is, you CAN actually be "good enough" to win the game you're in, but still lose it anyway because other players have a NEGATIVE effect on your team's performance. You CAN literally be the best player in the game and still lose. LoL is DESIGNED this way. If you deny this, you're literally denying reality. You're calling the world flat, the sky green, the moon a giant wheel of soft brie. And it really shits me off that so many people continue to cheerfully deny reality this way and dismiss anyone who's not so naive with "u mad cos u bad".