We need more of this mentality in league. Even if someone is playing like shit and feeds uncontrollably, I still try to take blame for the loss. I always try to go through a list of question for myself every game
Did I try to gank or roam for them early on to offset an early death if it was possible?
Was I even paying attention to the mini map to know when I could and should have helped them?
Did I offer helpful advice or strategies to them that would help them be much safer and catch up? (saying "Stop feeding" or "Stop dying so much" doesn't help people, it really doesn't.)
Did I let them get farm so that they could catch up?
Did I ward deep towards their lane so that if their fed laner comes out I don't start falling behind too?
Did I pick a champion or go for a certain build that was bad for the team comp?
Did I make the right calls in grouping, split pushing, and objectives?
Every game I lose where I think that someone was just feeding horribly (not inting, there really isn't much you can do about losing in that situation) I ask myself these questions, and often times I find that there was quite a bit that I could have done differently in the game that could have led to a different result. If you just afk farm in your lane and get kills on your laner only, you can't expect your behind teammates to magically be not behind anymore. Yes you can hard carry games even with feeding teammates, but it is much safer to have everyone fairly even in gold and be a threat so that the enemy team doesn't just have to worry about taking only you down. It's a team game and we need to help our teammates, even if they suck for that round.