This is why you are in ELO hell

https://en.wikipedia.org/wiki/Ressentiment

Ressentiment, in philosophy and psychology, is one of the forms of resentment or hostility. It is the French word for "resentment". Ressentiment is a sense of hostility directed at that which one identifies as the cause of one's frustration, that is, an assignment of blame for one's frustration. The sense of weakness or inferiority and perhaps jealousy in the face of the "cause" generates a rejecting/justifying value system, or morality, which attacks or denies the perceived source of one's frustration. This value system is then used as a means of justifying one's own weaknesses by identifying the source of envy as objectively inferior, serving as a defense mechanism that prevents the resentful individual from addressing and overcoming their insecurities and flaws. The ego creates an enemy in order to insulate itself from culpability.

Doesn't really matter what rank you are, and not everyone holds this affect, but I see people bronze, silver, all the way up to diamond with this mentality. (not surprisingly, however, I rarely see diamonds rage at /blame their teammates, while the behavior is rampant amongst bronze, silvers, golds, and plats) It;s the more psychological explanation that goes alongside the age-old advice "don't rage at your teammates; focus on your mistakes only and improving your own gameplay"

Just sharing this in case someone finds it helpful. Really though, this is so much more important to apply (or not apply, heh) to your real life; although ridding yourself of this mindset will help you climb the league ladder.