Look, my thing is if you know your own skill, you don't need your rank to prove it and because of that I couldn't give less shts how people feel about losing their rank because of me. If you can't pick up slack for someone else's flaws, get better so you can for the next time it happens. It's players like you who'd blame your teammates for losing a match. Even if that teammate actually sucks, how much better does it make you that you don't have the ability to still pull through with your other teammates? I'm not justifying what I do either, I know it's messed up, but I just don't care, which is why I still do it. But I mean hey, it's only a game, right?
[EDIT] Next time you lose a match, say this to yourself.
What can I do better to avoid this from happening, again.